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Moving Charges and Magnetism

AIPMT 2001MCQEasy📈 Topic in 12% papers+4−1
Ques. 1AIPMT 2001

If number of turns, area and current through a coil is given by n, A and i respectively then its magnetic moment will be

  1. niA
  2. n2iA
  3. niA2
  4. ni A

Answer

(1) niA

Solution

As per NCERT, the magnetic moment of a current loop is m = IA; for a coil of n turns the moments add.

m = niA

Answer: (1)

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Ques. 2AIPMT 2001

An electron having mass m and kinetic energy E enters a uniform magnetic field B perpendicularly, then its frequency will be

  1. eEqvB
  2. 2 meB
  3. eB2 m
  4. 2meBE
Ques. 3AIPMT 2001

In Thomson mass spectrograph, if E B, then the velocity of electron beam will be

  1. | E|| B|
  2. E B
  3. | B|| E|
  4. E2 B2
Ques. 4AIPMT 2000

The magnetic field at centre, P will be [figure]

  1. 04
  2. 0
  3. 02
  4. 4 0

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