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Magnetism and Matter · Question 11

NEET 2018MCQMedium📈 Topic in 25% papers+4−1
1

A thin diamagnetic rod is placed vertically between the poles of an electromagnet. When the current in the electromagnet is switched on, then the diamagnetic rod is pushed up, out of the horizontal magnetic field. Hence the rod gains gravitational potential energy. The work required to do this comes from

  1. The current source
  2. The magnetic field
  3. The lattice structure of the material of the rod
  4. The induced electric field due to the changing magnetic field

Answer

(1) The current source

Solution

A diamagnetic substance is repelled from the stronger part of a magnetic field, so the rod is pushed up out of the field.

The magnetic field only transfers energy; it is not itself a source of energy. The field of the electromagnet is set up by the current, and the current source supplies energy to maintain this current against the induced emf.

The energy gained by the rod (gravitational potential energy) is ultimately supplied by the current source.

Answer: (1)

NEET 2018

Keep practising — Magnetism and Matter

2

If 1 and 2 be the apparent angles of dip observed in two vertical planes at right angles to each other, then the true angle of dip is given by

  1. 2 = 2 1 + 2 2
  2. 2 = 2 1 - 2 2
  3. 2 = 2 1 - 2 2
  4. 2 = 2 1 + 2 2
NEET 2017
3

The magnetic susceptibility is negative for

  1. ferromagnetic material only
  2. paramagnetic and ferromagnetic materials
  3. diamagnetic material only
  4. paramagnetic material only
NEET 2016 (Phase 1)
4

A bar magnet is hung by a thin cotton thread in a uniform horizontal magnetic field and is in equilibrium state. The energy required to rotate it by 60 is W. Now the torque required to keep the magnet in this new position is

  1. W 3
  2. 3W
  3. 3W2
  4. 2W 3
NEET 2016 (Phase 2)
5

Following figures show the arrangement of bar magnets in different configurations. Each magnet has magnetic dipole moment m. Which configuration has highest net magnetic dipole moment ? [figure]

  1. (1)
  2. (2)
  3. (3)
  4. (4)
AIPMT 2014
6

A bar magnet of length 'l' and magnetic dipole moment 'M' is bent in the form of an arc as shown in figure. The new magnetic dipole moment will be [figure]

  1. 2 M
  2. M2
  3. M
  4. 3 M
NEET 2013
7

A bar magnet of 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

  1. MB/F
  2. BF/M
  3. MF/B
  4. F/MB
NEET 2013 (Karnataka)
8

A magnetic needle suspended parallel to a magnetic field requires 3 J of work to turn it through 60 . The torque needed to maintain the needle in this position will be

  1. 2 3 J
  2. 3 J
  3. 3 J
  4. 32 J
AIPMT 2012 (Mains)
9

A compass needle which is allowed to move in a horizontal plane is taken to a geomagnetic pole. It

  1. will become rigid showing no movement
  2. will stay in any position
  3. will stay in north-south direction only
  4. will stay in east-west direction only
AIPMT 2012 (Prelims)
10

A short bar magnet of magnetic moment 0.4 J T-1 is placed in a uniform magnetic field of 0.16 T. The magnet is in stable equilibrium when the potential energy is

  1. 0.064 J
  2. -0.064 J
  3. zero
  4. -0.082 J
AIPMT 2011 (Mains)
11

There are four light-weight-rod samples A, B, C, D separately suspended by threads. A bar magnet is slowly brought near each sample and the following observations are noted (i) A is feebly repelled (ii) B is feebly attracted (iii) C is strongly attracted (iv) D remains unaffected Which one of the following is true ?

  1. B is of a paramagnetic material
  2. C is of a diamagnetic material
  3. D is of a ferromagnetic material
  4. A is of a non-magnetic material
AIPMT 2011 (Prelims)

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