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Moving Charges and Magnetism · Question 85

AIPMT 2002MCQEasy📈 Topic in 0% papers+4−1
1

A charge q moves in a region where electric field and magnetic field both exist, then force on it is

  1. q ( v B )
  2. q E + q ( v B )
  3. q E + q ( B v )
  4. q B + q ( E v )

Answer

(2) q E + q ( v B )

Solution

As per NCERT, the Lorentz force on a charge q moving with velocity v in fields E and B:

F = q E + q ( v B )

(Note: B v = - v B, so option (3) has the wrong sign.)

Answer: (2)

AIPMT 2002

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2

The magnetic field of given length of wire for single turn coil at its centre is B then its value for two turns coil for the same wire is

  1. B/4
  2. B/2
  3. 4B
  4. 2B
AIPMT 2002
3

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
AIPMT 2001
4

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
AIPMT 2001
5

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
AIPMT 2001
6

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

  1. 04
  2. 0
  3. 02
  4. 4 0
AIPMT 2000

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