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DPP - 01 - Electromagnetic Induction

This document contains 10 multiple choice questions about electromagnetic induction: 1. It asks for the induced current in a circuit when the magnetic flux through it varies as a quadratic function of time. 2. It asks for the induced emf in a conducting loop placed in a magnetic field that varies as a cubic and quadratic function of time. 3. It asks for the magnitude of current through a resistor when the magnetic flux through a loop increases according to a given relation. The document then provides the answers to the 10 questions. It concludes with assigning homework questions from different exercises.

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277 views3 pages

DPP - 01 - Electromagnetic Induction

This document contains 10 multiple choice questions about electromagnetic induction: 1. It asks for the induced current in a circuit when the magnetic flux through it varies as a quadratic function of time. 2. It asks for the induced emf in a conducting loop placed in a magnetic field that varies as a cubic and quadratic function of time. 3. It asks for the magnitude of current through a resistor when the magnetic flux through a loop increases according to a given relation. The document then provides the answers to the 10 questions. It concludes with assigning homework questions from different exercises.

Uploaded by

Gully Gaming
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF, TXT or read online on Scribd
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(Physics) ELECTROMAGNETIC INDUCTION

DPP - 1
Q.1 Magnetic flux (in weber) in a closed circuit of resistance 20Ω varies with time t(s) as ϕ = 8t 2 −
9t + 5. The magnitude of the induced current at t = 0.25 s will be mA.
Q.2 ⃗ =
A conducting circular loop is placed in X − Y plane in presence of magnetic field B
(3t 3 ĵ + 3t 2 k̂) in SI unit. If the radius of the loop is 1 m, the induced emf in the loop, at time t =
2 s is nπV. The value of n is
Q.3 In the given figure, the magnetic flux through the loop increases according to the relation ϕB (t) =
10t 2 + 20t, where ϕB is in milliwebers and t is in seconds. The magnitude of current through R =
2Ω resistor at t = 5 s is mA.

Q.4 Radius of a circular loop is shrinking at rate of 1 mm/sec. When loop is placed in uniform
transverse magnetic field B = 2T. then find magnitude of induced emf when radius is 2 cm.
(A) 8πV (B) 8π × 10−5 V (C) 4π × 10−5 V (D) 4π × 10−2 V
Q.5 A coil (N, A, R) is placed in perpendicular magnetic field B. In time t it is turned by 180∘ then.
Find ratio of Average induced e. m. f. and induced charge flow in
t R
(A) R (B) R2 t (C) t
(D) N ⋅ O. T

Q.6 A coil of area ⃗A = (2ı̂ + 3k̂)m2 is placed in magnetic field ⃗B = (2ı̂ + 3ĵ + 4k̂)T. The magnetic flux
passing from the coil.
(A) 4 wb (B) 16 wb (C) 13 wb (D) 26 wb
Q.7 Find direction of Induced current in coils.

(A) (B)

(C)

APNI KAKSHA 1
(Physics) ELECTROMAGNETIC INDUCTION
Q.8 As shown in the figure, a magnet is brought towards a fixed coil. Due to this the induced Emf,
current & the charge are E, I & Q respectively. If the speed of the magnet is double then which of
the following statement is wrong.

(A) E increase (B) I increase (C) Q does not (D) Q increase change
Q.9 In a coil of resistance 100Ω, a current is induced by changing the magnetic flux through it as
shown in the figure. The magnitude of change in flux through the coil is

(A) 200 Wb (B) 225 Wb (C) 250 Wb (D) 275 Wb


Q.10 A conducting metal circular-wire-loop of radius r is placed perpendicular to a magnetic field
t
which varies with time as B = B0 e−τ, where B0 and τ are constants, at time t = 0. If the resistance
of the loop is R then the heat generated in the loop after a long time (t → ∞) is
π2 r4 B40 π2 r4 B20 π2 r4 B20 R π2 r4 B20
(A) (B) (C) (D)
2τR 2τR τ τR

APNI KAKSHA 2
(Physics) ELECTROMAGNETIC INDUCTION
ANSWER KEY
1. 250 2. 12 3. 60 4. (B) 5. (C) 6. (B) 7. ()
8. (D) 9. (C) 10. (B)

Home Work
Ex. 1 Q. 1,3.7,910,11,12,15,16,

Ex. 2 Q.1,6,14,16,
,

Ex.3 Q1,2,

Ex.4 Q
Ex.5 Q.

APNI KAKSHA 3

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