Target DPP Test Contact Number: 9667591930 / 8527521718

1. A magnet of magnetic moment 50iˆA − m2 is placed 5. A thin diamagnetic rod is placed vertically between
along the x-axis in a magnetic field the poles of an electromagnet. When the current in the
→ electromagnet is switched on, then the diamagnetic rod
B = (0. 5 î + 3. 0 ĵ)T . The torque acting on the is pushed up, out of the horizontal magnetic field. Hence
magnet is the rod gains gravitational potential energy. The work
required to do this comes from:
1. 175 k̂ N-m
1. the current source
2. 150 k̂ N-m
2. the magnetic field
3. 75 k̂ N-m
3. the lattice structure of the material of the rod
4. 25√37 k̂ N-m
the induced electric field due to the changing
4.
magnetic field.
2. A bar magnet of length 3 cm has points A and B along
its axis at distances of 24 cm and 48 cm on the opposite
sides. Ratio of magnetic fields at these points will be
6. At a temperature of 30°C, the susceptibility of a
ferromagnetic material is found to be x. Its susceptibility
at 333°C is:
1. x
(a) 8 (b) 1 2. 0.5x
2√2 3. 2x
(c) 3 (d) 4 4. 11.1x

3. A bar magnet A of magnetic moment MA is found to 7. Two bar magnets are held together tightly in a
oscillate at a frequency twice that of magnet B having vibration magnetometer. When their like poles are
identical size as magnet A, of magnetic moment MB together, they make 20 oscillations per minute and when
when placed in a vibrating magneto-meter. We may say their unlike poles are together, they make 8 oscillations
that per minute. The ratio of the magnetic dipole moments of
(1) MA = 2MB two bar magnets is:
(2) MA = 8MB 1. 29 : 21
2. 6 : 15
(3) MA = 4MB
3. 1 : 6
(4) MB = 8MA 4. 25 : 4

4. A magnetic needle suspended parallel to a magnetic 8. The magnetic lines of force inside a bar magnet are:
field requires √3 J of work to turn it through 60°. The 1. from south to the north pole.
torque needed to maintain the needle in this position will 2. from north to the south pole.
be
3. not present.
1. 2√3J
4. intersecting each other.
2. 3 J
3. √3 J
4. 32 J 9. A substance is placed in an external magnetic field. If
the direction of induced dipole moment is opposite to the
direction of the applied magnetic field, then the
substance may be
1. Paramagnetic
2. Diamagnetic
3. Ferromagnetic
4. Both (1) & (3)

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 Target DPP Test Contact Number: 9667591930 / 8527521718

10. When a substance is kept in a magnetic field, it gets 15. What will be the energy loss per hour in the iron core
repelled. Which of the following represents its of a transformer if the area of its hysteresis loop is
susceptibility? equivalent to 2500 erg/cm3. The frequency of the
1. -0.0004 alternating current is 50 Hz. The mass of the core is 10
2. 0.0004
kg and the density of iron is 7.5 gm/cm3 :
3. 1.000
1. 2 × 102 Joule
4. -1.000
2. 4 × 103 Joule
4
11. The time period of vibration of a bar-magnet in a 3. 6 × 105 Joule
vibration magnetometer is T . If the magnet is cut into n 4. 8 × 10 Joule
identical parts such that the length of each part is equal
to the length of the original magnet, then the time period 16. In the given diagram, substance A(Zn) and substance
of vibration of one part in the vibration magnetometer is: B(Mn) are placed at the ends of a long current-carrying
1. T solenoid, then:
n
2. nT
3. n2 T
4. T

12. The possible value of magnetic susceptibility of a

diamagnetic material can be:
1. −2.45
2. 0.75
3. −0.5 1. A will move away from the center C and B will move
4. 1.67 towards the center C.
2. A will move towards C and B will move away from
13. An iron rod of susceptibility 599 is subjected to a the center C.
magnetising field of 1200 A m−1 . The permeability of 3. Both will move away from the center C.
4. Both will move towards the center C.
the material of the rod is:(μ0 = 4π × 10−7 T m A−1 )
1. 8.0 × 10−5 T m A−1
2. 2.4π × 10−5 T m A−1
3. 2.4π × 10−7 T m A−1
4. 2.4π × 10−4 T m A−1

14. Two short bar magnets have magnetic moments 1.20

Am2 and 1.00 Am2 respectively. They are kept on
a horizontal table parallel to each other with their north
poles pointing towards the south. They have a common
magnetic equator and are separated by a distance of 20.0
cm. The value of the resultant horizontal magnetic
induction at the mid-point O of the line joining
their centres is (Horizontal components of Earth’s
magnetic induction is 3. 6 x 10−5 Wb m−2 )
1. 3.60 × 10−5 Wb m−2
2. 3.5 × 10−5 Wb m−2
3. 2.56 × 10−4 Wb m−2
4. 2.2 × 10−4 Wb m−2

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 Target DPP Test Contact Number: 9667591930 / 8527521718

17. Which of the following is the correct representation 20. Mark out the correct options.
of magnetic field lines? (a) Diamagnetism occurs in all materials.
(b) Diamagnetism results from the partial alignment of
permanent magnetic moment.
(c) The magnetizing field intensity H is always zero in
free space.
(d) The magnetic field of induced magnetic moment is
opposite to the applied field.
Choose the correct option
1. (a), (b)
2. (b), (c)
3. (c), (d)
4. (a), (d)

21. The magnetic moment of electron due to orbital

motion is proportional to:
(where n = principle quantum number)
1. 12
n
2. n1
3. n2
4. n
1. (g), (c) 2. (d), (f)
3. (a), (b) 4. (c), (e) 22. The coercive force for a certain magnet is
3 × 103 A/m. This magnet is placed within a solenoid
having 40 turns/cm. What current should be passed
18. A horizontal circular loop carries a current that looks
clockwise when viewed from above. It is replaced by an through the solenoid so that the magnet is
equivalent magnetic dipole consisting of a south pole S demagnetized?
and a north pole N. 1. 0.75 A 2. 75 A
(a) The line SN should be along a diameter of the loop. 3. 1.33 A 4. 133 A
(b) The line SN should be perpendicular to the plane of
the loop.
(c) The south pole should be below the loop. 23. A small permanent magnet is placed 'antiparallel' to a
(d) The north pole should be below the loop uniform magnetic field B. A null point is found at a
Choose the correct option distance r, on the axis of the magnet. Then, r is
1. (a) , (b) proportional to (nearly):
2. (b) , (d) 1. B−3 2. B−2
3. (c) , (d)
3. B−1/2 4. B−1/3
4. (a) , (d)

19. A long, straight wire carries a current i. The

−4
magnetizing field intensity H is measured at a point P 24. A paramagnetic substance of susceptibility 3×10
−1
close to the wire. A long, cylindrical iron rod is brought is placed in a magnetic field of 4 × 10−4 A-m . The
−1
close to the wire so that the point P is at the centre of intensity of magnetization in the units of A-m is:
the rod. The value of H at P will: 1. 1.33 × 108 2. 0.75 × 10−8
1. increase many times 2. decrease many times 3. 12 × 10−8 4. 14 × 10−8
3. remain almost constant 4. become zero

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 Target DPP Test Contact Number: 9667591930 / 8527521718

25. When a diamagnetic material is placed in a magnetic 30. Given below are two statements:
field, the field strength within the material is: Permeability of a paramagnetic substance
Statement I:
1. increased decreases when temperature is increased.
2. decreased As temperature increases, random
3. unchanged molecular motion increases and
Statement II:
fluctuating with time: first increasing and then molecular magnets become more
4. randomly oriented.
decreasing

1. Statement I is incorrect and Statement II is correct.

26. Given below are two statements: 2. Both Statement I and Statement II are correct.
Gauss's law for magnetism states that 3. Both Statement I and Statement II are incorrect.
Assertion (A): the net magnetic flux through any closed 4. Statement I is correct and Statement II is incorrect.
surface is zero.
The magnetic monopoles do not exist.
North and South poles occur in pairs,
Reason (R):
allowing vanishing net magnetic flux
through the surface. Fill OMR Sheet*
*If above link doesn't work, please go to test link from
1. (A) is True but (R) is False.
where you got the pdf and fill OMR from there
2. (A) is False but (R) is True.
Both (A) and (R) are True and (R) is the correct
3.
explanation of (A).
Both (A) and (R) are True but (R) is not the correct
4.
explanation of (A).
CLICK HERE to get
27. If a magnetic monopole were to exist, what would be FREE ACCESS for 2
appropriate units of its ‘strength’?
1. Wb/T days of ANY NEETprep
2. T/m3
3. C.m/s course
4. D/T

28. The universal property of all substances is:

1. diamagnetism only
2. ferromagnetism only
3. paramagnetism only
4. both paramagnetism and diamagnetism

29. A bar magnet of the magnetic moment M is placed

at right angles to a magnetic induction B. If a force F is
experienced by each pole of the magnet, the length of
the magnet will be:
MB BF
1. F
2. M
MF F
3. B
4. MB

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