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 TATVA for JEE
(Full Syllabus)
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General Terms
○ Current Combination of
○ Drift Velocity
Batteries
○ Mobility
○ Series & Parallel
○ Microscopic
○ Power
Ohm’s Law
○ Temperature
dependance Current
○ Colour Coding
Electricity

Combination of
Electronic Instruments
Resistors
○ Meter Bridge
○ Series, Parallel
○ Ammeter, Voltmeter
○ WSB
○ Potentiometer
○ Symmetry Circuits
 Electric Current
The Rate of Flow of Charge through a
Cross Section is called as Electric Current
 Current Density
It is defined as Current per Unit Area
I
Current is a Scalar Quantity,
but Current Density is a Vector
Quantity
Motion of electrons in absence of
Electric Field
 Drift Velocity
It is the Average velocity with which an electron is
drifted towards positive terminal of battery in the
presence of External Electric Field
 L

V
 Relaxation Time
It is the Average time between two Successive
collisions
 Mobility

It is defined as Drift Velocity per Unit Electric Field

 Ohm’s Law

V = IR

V
Resistance
 Resistivity

Dependence of resistivity on various parameter:

● It does not depend upon material dimensions.

● It depends upon temperature as well as material.
Temperature dependence of Resistance

For Conductors
Resistivity increases with increase in
temperature. Because with increase in
temperature, relaxation time decreases
which cause the increase in resistance.

R2 = R1(1 + 𝛼ΔT)
Temperature dependence of Resistance

For Semiconductors
Resistivity decreases with increase in
temperature. Because with increase in
temperature number of free electrons
increases due to which resistance
decreases.
 JEE Main 01st Feb 2024 S-1
The current in a conductor is expressed as
I = 3t2 + 4t3, where I is in Ampere and t is in
second. The amount of electric charge that
flows through a section of the conductor during
t = 1 s to t = 2s is is ______ C.
 JEE Main 01st Feb 2024 S-1
The current in a conductor is expressed as
I = 3t2 + 4t3, where I is in Ampere and t is in
second. The amount of electric charge that
flows through a section of the conductor during
t = 1 s to t = 2s is is ______ C.
Ans : 22
 JEE Main 29th Jan 2024 S-1
The electric current through a wire varies with
time as I = I0 + 𝛽t, where I0 = 20 A and 𝛽 = 3A/s.
The amount of electric charge crossed through
a section of the wire in is HOME WORK

A 1000C

B 80C

C 1600C

D 800C
 8 April S1 JEE Main 2024

Resistance of a wire at 0°C, 100°C and t °C is

found to be 10 Ω, 10.2 Ω and 10.95Ω respectively.
The temperature t in Kelvin scale is ________.
 8 April S1 JEE Main 2024

Resistance of a wire at 0°C, 100°C and t °C is

found to be 10 Ω, 10.2 Ω and 10.95Ω respectively.
The temperature t in Kelvin scale is ________.

Ans : 748
 4 April S2 JEE Main 2024

Two wires A and B are made up of the same

material and have the same mass. Wire A has
radius of 2.0 mm
and wire B has radius of 4.0 mm. The resistance
of wire B is 2. The resistance of wire A is
_______ .
 4 April S2 JEE Main 2024

Two wires A and B are made up of the same

material and have the same mass. Wire A has
radius of 2.0 mm
and wire B has radius of 4.0 mm. The resistance
of wire B is 2. The resistance of wire A is
_______ .

Ans : 32
 JEE Main 6th April 2023, S-1

4 The resistivity (𝜌) of semiconductor varies with

temperature. Which of the following curve
represents the correct behavior

A B

C D
 JEE Main 6th April 2023, S-1

4 The resistivity (𝜌) of semiconductor varies with

temperature. Which of the following curve
represents the correct behavior

A B

C D
 JEE Main 30th Jan 2023, S-1

4 The charge flowing in a conductor changes with

time as Q(t) = ⍺t - βt2 + γt3. Where ⍺, β and γ are
constants. Minimum value of current is:

D
 JEE Main 30th Jan 2023, S-1

4 The charge flowing in a conductor changes with

time as Q(t) = ⍺t - βt2 + γt3. Where ⍺, β and γ are
constants. Minimum value of current is:

D
 JEE Main 31st Jan 2023, S-1

4 The drift velocity of electrons for a conductor

connected in an electrical circuit is Vd. The
conductor in now replaced by another
conductor with same material and same length
but double the area of cross section. The
applied voltage remains same. The new drift
velocity of electrons will be

A Vd

B Vd/2

C Vd/4

D 2Vd
 JEE Main 31st Jan 2023, S-1

4 The drift velocity of electrons for a conductor

connected in an electrical circuit is Vd. The
conductor in now replaced by another
conductor with same material and same length
but double the area of cross section. The
applied voltage remains same. The new drift
velocity of electrons will be

A Vd

B Vd/2

C Vd/4

D 2Vd
4 Find the current if a point charge Q located on
rim of ring of radius R moves with angular
velocity 𝜔.

Q A

B
R
C

D
Q

R
4 Find the current if a point charge Q located on
rim of ring of radius R moves with angular
velocity 𝜔.

Q A

B
R
C

D
4 The resistance of a wire is ‘R’ ohm. If it is melted
and stretched to ‘n’ times its original length, its
new resistance will be:

A R/n

B n2R

C R/n2

D nR
4 The resistance of a wire is ‘R’ ohm. If it is melted
and stretched to ‘n’ times its original length, its
new resistance will be:

A R/n

B n2R

C R/n2

D nR
 JEE Main 25th Jan, 2023 S-2

4 The resistance of a wire is 5Ω. It’s new resistance

in ohm if stretched to 5 times of its original
length will be:

A 625

B 5

C 125

D 25
 JEE Main 25th Jan, 2023 S-2

4 The resistance of a wire is 5Ω. It’s new resistance

in ohm if stretched to 5 times of its original
length will be:

A 625

B 5

C 125

D 25
 JEE Main 12th April 2023, S-1

4 A wire of resistance 160 Ω is melted and drawn in

a wire of one-fourth of its length. The new
resistance of the wire will be

A 640 Ω

B 40 Ω

C 10 Ω

D 16 Ω
 JEE Main 12th April 2023, S-1

4 A wire of resistance 160 Ω is melted and drawn in

a wire of one-fourth of its length. The new
resistance of the wire will be

A 640 Ω

B 40 Ω

C 10 Ω

D 16 Ω
Kirchoff’s Current Law (KCL)
Kirchoff’s Voltage Law (KVL)
4 In the circuit shown in figure, the potential
difference between points A & B is ?

A -3 V

B +3 V

C +6 V

D +9 V
4 In the circuit shown in figure, the potential
difference between points A & B is ?

A -3 V

B +3 V

C +6 V

D +9 V
 JEE Main 6th April 2023, S-2

4 Figure shows a part of an electric circuit. The

potentials at points a, b and c are 30 V, 12 V and
2 V respectively. The current through the 20 Ω
resistor will be

A 1.0 A

B 0.2 A

C 0.4 A

D 0.6 A
 JEE Main 6th April 2023, S-2

4 Figure shows a part of an electric circuit. The

potentials at points a, b and c are 30 V, 12 V and
2 V respectively. The current through the 20 Ω
resistor will be

A 1.0 A

B 0.2 A

C 0.4 A

D 0.6 A
 SERIES Combination
The current is the same through each resistor.

C1 C2 C3
R1 R2 R3

V
 Important Points

● If n identical resistors are connected in Series,

then effective Resistance is nR
● In Series Combination the effective resistance is
Greater than Greatest.
Two Resistors in Series
 PARALLEL Combination
The Potential Difference is the same across each Resistor.
C1
R1

RC22

C3
R3

V
 Important Points

● If n identical resistors are connected in Parallel,

then effective Resistance is R / n
● In Parallel Combination the effective resistance
is Lesser than the Least.
PARALLEL
 JEE Main 27th Jan 2024 S-1

A wire of resistance R and length L is cut into 5

equal parts. If these parts are joined parallely,
then resultant resistance will be :

B 5R

D 25 R
 JEE Main 27th Jan 2024 S-1

A wire of resistance R and length L is cut into 5

equal parts. If these parts are joined parallely,
then resultant resistance will be :

B 5R

D 25 R
 5 April S2 JEE Main 2024

A wire of resistance 20𝛺 is divided into 10 equal

parts, resulting pairs. A combination of two parts
are connected in parallel and so on. Now
resulting pairs of parallel combination are
connected in series. The equivalent resistance of
final combination is ________𝛺.
 5 April S2 JEE Main 2024

A wire of resistance 20𝛺 is divided into 10 equal

parts, resulting pairs. A combination of two parts
are connected in parallel and so on. Now
resulting pairs of parallel combination are
connected in series. The equivalent resistance of
final combination is ________𝛺.

Ans : 5
 5 April S1 JEE Main 2024

In the given figure R1 = 10Ω, R2 = 8Ω , R3 =4Ω and

R4 =8Ω. Battery is ideal with emf 12V. Equivalent
resistance of the circuit and current supplied by
battery are respectively:

A 10.5Ω and 1.14A

B 12Ω and 1A

C 10.5Ω and 1 A

D 12Ω and 11.4A

 5 April S1 JEE Main 2024

In the given figure R1 = 10Ω, R2 = 8Ω , R3 =4Ω and

R4 =8Ω. Battery is ideal with emf12V. Equivalent
resistance of the circuit and current supplied by
battery are respectively:

A 10.5Ω and 1.14A

B 12Ω and 1A

C 10.5Ω and 1 A

D 12Ω and 11.4A

 JEE Main 30th Jan 2024 S-1

A potential divider circuit is shown in figure. The

output voltage V0 is :

A 12 m V

B 0.5 V

C 4V

D 2mV
 JEE Main 30th Jan 2024 S-1

A potential divider circuit is shown in figure. The

output voltage V0 is :

A 12 m V

B 0.5 V

C 4V

D 2mV
 JEE Main 29th Jan 2024 S-2

In the given circuit, the current in resistance R3

is:

A 2.5 A

B 1.5 A

C 1A

D 2A
 JEE Main 29th Jan 2024 S-2

In the given circuit, the current in resistance R3

is:

A 2.5 A

B 1.5 A

C 1A

D 2A
 JEE Main 31st Jan 2024 S-1

Equivalent resistance of the following network is

_______𝛺.
 JEE Main 31st Jan 2024 S-1

Equivalent resistance of the following network is

_______𝛺.

Ans : 1
 9 April S1 JEE Main 2024

The equivalent resistance between A and B is :

A 27 Ω

B 19 Ω

C 25 Ω

D 18 Ω
 9 April S1 JEE Main 2024

The equivalent resistance between A and B is :

A 27 Ω

B 19 Ω

C 25 Ω

D 18 Ω
 JEE Main 10th Jan 2023, S-1

4 10 resistors each of resistance 10 Ω can be

connected in such as to get maximum and
minimum equivalent resistance. The ratio of
maximum and minimum equivalent resistance
will be ______.
 JEE Main 10th Jan 2023, S-1

4 10 resistors each of resistance 10 Ω can be

connected in such as to get maximum and
minimum equivalent resistance. The ratio of
maximum and minimum equivalent resistance
will be ______.

Answer: 100
 JEE Main 15th April 2023, S-1

4 A network of four resistances is connected to 9 V

battery, as shown in figure. The magnitude of
voltage difference between the points A and B is
_____ V.
 JEE Main 15th April 2023, S-1

4 A network of four resistances is connected to 9 V

battery, as shown in figure. The magnitude of
voltage difference between the points A and B is
_____ V.

Answer: 3
 JEE Main 11th April 2023, S-2

4
The current flowing through R2 is:

D
 JEE Main 11th April 2023, S-2

4
The current flowing through R2 is:

D
 JEE Main 8th April 2023, S-2

4 The equivalent resistance between A and B as

shown in figure is:

A 20 k𝛺

B 30 k𝛺

C 5 k𝛺

D 10 k𝛺
 JEE Main 8th April 2023, S-2

4 The equivalent resistance between A and B as

shown in figure is:

A 20 k𝛺

B 30 k𝛺

C 5 k𝛺

D 10 k𝛺
Wheatstone Bridge

R1 R3

R5

R2 R4
Balanced Wheatstone Bridge

R1 R3

R5

R2 R4
Symmetrically Unbalanced WSB

R1 R2

R3

R2 R1
USB ka video banya hai…uska thumbnail dal do
 9 April S2 JEE Main 2024

The effective resistance between A and B, if

resistance of each resistor is R, will be:

D
(As resistance connected with P & Q will
not considered for calculation because
both are at same potential)
 9 April S2 JEE Main 2024

The effective resistance between A and B, if

resistance of each resistor is R, will be:

D
 JEE Main 01st Feb 2024 S-2
To measure the temperature coefficient of
resistivity 𝛼 of a semiconductor, an electrical
arrangement shown in the figure is prepared.
The arm BC is made up of the semiconductor.
The experiment is being conducted at 25oC
and resistance of the semiconductor arm is 3
m𝛺. Arm BC is cooled at a constant rate of
2oC/s. If the galvanometer C shows no
deflection after 10 s, then 𝛼 is :

A -2.5 × 10-2 oC-1

B -1.5 × 10-2 oC-1

C -2 × 10-2 oC-1

D -1 × 10-2 oC-1
 JEE Main 01st Feb 2024 S-2
To measure the temperature coefficient of
resistivity 𝛼 of a semiconductor, an electrical
arrangement shown in the figure is prepared.
The arm BC is made up of the semiconductor.
The experiment is being conducted at 25oC
and resistance of the semiconductor arm is 3
m𝛺. Arm BC is cooled at a constant rate of
2oC/s. If the galvanometer C shows no
deflection after 10 s, then 𝛼 is :

A -2.5 × 10-2 oC-1

B -1.5 × 10-2 oC-1

C -2 × 10-2 oC-1

D -1 × 10-2 oC-1
 JEE Main 1st Feb 2023, S-1

4 The equivalent resistance between A and B of

the network shown in figure is xR/3
 JEE Main 1st Feb 2023, S-1

4 The equivalent resistance between A and B of

the network shown in figure is xR/3

Answer: 8
4 Find the effective resistance in the given figure
between points A and B.

D
4 Find the effective resistance in the given figure
between points A and B.

D
4 Find The effective resistance in the given figure
between points A and B ?

A
4 Find The effective resistance in the given figure
between points A and B ?

A B
4 Find The effective resistance in the given figure
between points A and B ? HOME WORK

A
CELL
E

r
 Series Combination of Cells
● Cell are said to be in series if same current is running in all of them.

r1 Ɛ1 r2 Ɛ2 r3 Ɛ3

Ɛeq

req

● Req = r1 + r2 + r3
● Ɛeq = Ɛ1 + Ɛ2 + Ɛ3
 Parallel Combination of cell
● Cell are said to be in Parallel if same Potential Difference exists
across all Resistors.
r1

r2

r3

Ɛeq

req
 8 April S1 JEE Main 2024

In the given circuit, the terminal potential

difference of the cell is:

A 4V

B 2V

C 3V

D 1.5 V
 8 April S1 JEE Main 2024

In the given circuit, the terminal potential

difference of the cell is:

A 4V

B 2V

C 3V

D 1.5 V
 JEE Main 30th Jan 2024 S-1
Two cells are connected in opposition as shown.
Cell E1 is of 8 V emf and 2 𝛺 internal resistance;
the cell E2 is of 2V emf and 4 𝛺 internal
resistance. The terminal potential difference of
cell E2 _____ is V.
 JEE Main 30th Jan 2024 S-1
Two cells are connected in opposition as shown.
Cell E1 is of 8 V emf and 2𝛺 internal resistance;
the cell E2 is of 2V emf and 4𝛺 internal
resistance. The terminal potential difference of
cell E2 _____ is V.
Ans : 6
 JEE Main 29th Jan 2022, S-2

4 The combination of two identical cells, whether

connected in series or parallel combination
provides the same current through an external
resistance of 2Ω. The value of internal resistance
of each cell is:

A 2Ω

B 4Ω

C 6Ω

D 8Ω
 JEE Main 29th Jan 2022, S-2

4 The combination of two identical cells, whether

connected in series or parallel combination
provides the same current through an external
resistance of 2Ω. The value of internal resistance
of each cell is:

A 2Ω

B 4Ω

C 6Ω

D 8Ω
 25 Jan-Shift 2 JEE 2023

4 Two cells are connected between points A and B

as shown. Cell 1 has emf of 12 V and internal
resistance of 3Ω. Cell 2 has emf of 6V and
internal resistance of 6Ω. An external resistor R
of 4Ω is connected across A and B. The current
flowing through R will be_________A.
 25 Jan-Shift 2 JEE 2023

4 Two cells are connected between points A and B

as shown. Cell 1 has emf of 12 V and internal
resistance of 3Ω. Cell 2 has emf of 6V and
internal resistance of 6Ω. An external resistor R
of 4Ω is connected across A and B. The current
flowing through R will be_________A.

Answer: 1
 JEE Main 11th April 2023, S-2

4 Two identical cells each of emf 1.5 V are

connected in series across a 10 𝝮 resistance. An
ideal voltmeter connected across 10 𝝮
resistance reads 1.5 V. The internal resistance of
each cell is ___________ 𝝮. Home Work
 JEE Main 11th April 2023, S-2

4 In the circuit diagram shown in figure given

below, the current flowing through resistance
3𝝮 Is A. The value of x is _________
 JEE Main 11th April 2023, S-2

4 In the circuit diagram shown in figure given

below, the current flowing through resistance
3𝝮 Is A. The value of x is _________

Answer : 1
Electrical Power
 Electrical Power

If p = constant

If p = variable
 Rated Power & Rated Voltage

● Bulb available in market are rated

to indicate their power.

● If rating of a bulb is given to be “100

W , 220 V” - then a voltage of more
than 220V can damage the bulb.

● If potential difference across bulb is

220V, then it will produce power of
100 W.
Maximum Power Transfer Theorem
Maximum Power Transfer Theorem
 5 April S2 JEE Main 2024

The ratio of heat dissipated per second through

the resistance 5𝛺 and 10𝛺 in the circuit given
below is :

A 4:1

B 1:1

C 2:1

D 1:2
 5 April S2 JEE Main 2024

The ratio of heat dissipated per second through

the resistance 5𝛺 and 10𝛺 in the circuit given
below is :

A 4:1

B 1:1

C 2:1

D 1:2
 4 April S2 JEE Main 2024

An electric bulb rated 50 W – 200 V is connected

across a 100 V supply. The power dissipation of
the bulb is -

A 12.5 W

B 25 W

C 100 W

D 50 W
 4 April S2 JEE Main 2024

An electric bulb rated 50 W – 200 V is connected

across a 100 V supply. The power dissipation of
the bulb is -

A 12.5 W

B 25 W

C 100 W

D 50 W
 JEE Main 31th Jan 2024 S-2

By what percentage will the illumination of the

lamp decrease if the current drops by 20%?

A 46 %

B 56 %

C 26 %

D 36 %
 JEE Main 31th Jan 2024 S-2

By what percentage will the illumination of the

lamp decrease if the current drops by 20%?

A 46 %

B 56 %

C 26 %

D 36 %
 JEE Main 13th April 2023 S-1

4 A potential Vo is applied across a uniform wire

of resistance R. The power dissipation is P1. The
wire is then cut into two equal halves and a
potential of Vo is applied across the length of
each half. The total power dissipation across
two wires is P2. The ratio P2 : P1 is √x : 1. The value
of x is_____
 JEE Main 13th April 2023 S-1

4 A potential Vo is applied across a uniform wire

of resistance R. The power dissipation is P1. The
wire is then cut into two equal halves and a
potential of Vo is applied across the length of
each half. The total power dissipation across
two wires is P2. The ratio P2 : P1 is √x : 1. The value
of x is_____
Answer: 16
4 The charge flowing through a resistance R
varies with time t as Q = at – bt2, where a and b
are positive constants. The total heat produced
in R is

D
Given, Q = at – bt2

At t = 0, Q = 0 ⇒ I = 0
Also, I = 0 at t = a/2b
∴ Total heat produced in resistance R,
4 The charge flowing through a resistance R
varies with time t as Q = at – bt2, where a and b
are positive constants. The total heat produced
in R is

D
 Meter Bridge
● It is a Device which is used to Measure
Unknown Resistance
● It is Based on the Principle of Balanced
Wheatstone Bridge
End Correction
Battery
 Galvanometer

It is a Device which is used

to measure Small Currents.
Galvanometer
 Ammeter
It is a Device which is used to measure Large Currents.
 Voltmeter
It is a Device which is used to measure Potential Difference.
 JEE Main 15th April 2023 S-1

For designing a voltmeter of range 50 V and an ammeter of

range 10 mA using a galvanometer which has a coil of
resistance 54 Ω showing a full scale deflection for 1 mA as in
figure.
(A) for voltmeter R = 50kΩ (B) for ammeter r = 0.2Ω
(C) for ammeter r = 6Ω (D) for voltmeter R = 5kΩ
(E) for voltmeter R = 500Ω
Choose the correct answer from the options given below:

A (C) and (D)

B (A) and (B)

C (C) and (E)

D (A) and (C)

 JEE Main 15th April 2023 S-1

For designing a voltmeter of range 50 V and an ammeter of

range 10 mA using a galvanometer which has a coil of
resistance 54 Ω showing a full scale deflection for 1 mA as in
figure.
(A) for voltmeter R = 50kΩ (B) for ammeter r = 0.2Ω
(C) for ammeter r = 6Ω (D) for voltmeter R = 5kΩ
(E) for voltmeter R = 500Ω
Choose the correct answer from the options given below:

A (C) and (D)

B (A) and (B)

C (C) and (E)

D (A) and (C)

 JEE Main 29th Jan 2024 S-1
A galvanometer having coil resistance 10 𝛺
shows a full scale deflection for a current of 3
mA. For it to measure a current of 8A, the value
of the shunt should be:

A 3 × 10-3𝛺

B 3.75 × 10-3𝛺

C 4.8 × 10-3𝛺

D 2.75 × 10-3𝛺
 JEE Main 29th Jan 2024 S-1
A galvanometer having coil resistance 10𝛺
shows a full scale deflection for a current of 3
mA. For it to measure a current of 8A, the value
of the shunt should be:

A 3 × 10-3𝛺

B 3.75 × 10-3𝛺

C 4.8 × 10-3𝛺

D 2.75 × 10-3𝛺
 JEE Main 01st Jan 2024 S-1
A galvanometer has a resistance of 50𝛺 and it
allows maximum current of 5 mA. It can be
converted into voltmeter to measure upto by 100
V connecting in series a resistor of resistance :

A 20050 𝛺

B 5975 𝛺

C 19950 𝛺

D 19500 𝛺
 JEE Main 01st Jan 2024 S-1
A galvanometer has a resistance of 50𝛺 and it
allows maximum current of 5 mA. It can be
converted into voltmeter to measure upto by 100
V connecting in series a resistor of resistance :

A 20050 𝛺

B 5975 𝛺

C 19950 𝛺

D 19500 𝛺
 JEE Main 29th Jan 2024 S-1
The deflection in moving coil galvanometer falls
from 25 divisions to 5 division when a shunt of
24𝛺 is applied. The resistance of galvanometer
coil will be :

A 96𝛺

B 12𝛺

C 48𝛺

D 100𝛺
 JEE Main 29th Jan 2024 S-1
The deflection in moving coil galvanometer falls
from 25 divisions to 5 division when a shunt of
24𝛺 is applied. The resistance of galvanometer
coil will be :

A 96𝛺

B 12𝛺

C 48𝛺

D 100𝛺
 JEE Main 27th Jan 2024 S-2

A current of 200𝜇A deflects the coil of a moving

coil galvanometer through 60o. The current to
cause deflection through radian is:

A 120 𝜇A

B 30 𝜇A

C 180 𝜇A

D 60 𝜇A
 JEE Main 27th Jan 2024 S-2

A current of 200𝜇A deflects the coil of a moving

coil galvanometer through 60o. The current to
cause deflection through radian is:

A 120 𝜇A

B 30 𝜇A

C 180 𝜇A

D 60 𝜇A
 Potentiometer

● It is a Device which is used to

measure Potential Difference.
● It is an Ideal Voltmeter.
L

V0 (Driving voltage)
L

V0 (Driving voltage)
 POTENTIOMETER

R
є
r
ℓ
ℓ = Null Point Length

V0
 4 April S1 JEE Main 2024

To measure the internal resistance of a battery,

potentiometer is used. For R = 10 Ω, the balance
point is observed at l = 500 cm and for R = 1 Ω
the balance point is observed at l = 400 cm. The
internal resistance of the battery is
approximately:

A 0.3 Ω

B 0.4 Ω

C 0.1 Ω

D 0.2 Ω
 4 April S1 JEE Main 2024

To measure the internal resistance of a battery,

potentiometer is used. For R = 10 Ω, the balance
point is observed at l = 500 cm and for R = 1 Ω
the balance point is observed at l = 400 cm. The
internal resistance of the battery is
approximately:

A 0.3 Ω

B 0.4 Ω

C 0.1 Ω

D 0.2 Ω
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