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Moving Charges and Magnetism

AIPMT 2005MCQMedium📈 Topic in 12% papers+4−1
Ques. 1AIPMT 2005

A coil in the shape of an equilateral triangle of side l is suspended between the pole pieces of a permanent magnet such that B is in plane of the coil. If due to a current i in the triangle a torque acts on it, the side l of the triangle is

  1. 2 3 ( Bi )
  2. 2 ( 3Bi )1/2
  3. 2 3 ( Bi )1/2
  4. 1 3 Bi

Answer

(2) 2 ( 3Bi )1/2

Solution

B lies in the plane of the coil, so m B and = iAB

Area of the equilateral triangle A = 34l2

= 34l2 iB

l2 = 4 3Bi

l = 2 ( 3Bi )1/2

Answer: (2)

Keep practising — Moving Charges and Magnetism

Ques. 2AIPMT 2004

A galvanometer of 50 ohm resistance has 25 divisions. A current of 4 10-4 ampere gives a deflection of one division. To convert this galvanometer into a voltmeter having a range of 25 volts, it should be connected with a resistance of

  1. 2500 as a shunt
  2. 2450 as a shunt
  3. 2550 in series
  4. 2450 in series
Ques. 3AIPMT 2004

To convert a galvanometer into a voltmeter one should connect a

  1. high resistance in series with galvanometer
  2. low resistance in series with galvanometer
  3. high resistance in parallel with galvanometer
  4. low resistance in parallel with galvanometer
Ques. 4AIPMT 2003

A charged particle moves through a magnetic field in a direction perpendicular to it. Then the

  1. speed of the particle remains unchanged
  2. direction of the particle remains unchanged
  3. acceleration remains unchanged
  4. velocity remains unchanged
Ques. 5AIPMT 2003

A long solenoid carrying a current produces a magnetic field B along its axis. If the current is doubled and the number of turns per cm is halved, the new value of the magnetic field is

  1. B/2
  2. B
  3. 2B
  4. 4B
Ques. 6AIPMT 2002

To convert a galvanometer into a voltmeter one should connect a

  1. high resistance in series with galvanometer
  2. low resistance in series with galvanometer
  3. high resistance in parallel with galvanometer
  4. low resistance in parallel with galvanometer.
Ques. 7AIPMT 2002

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 )
Ques. 8AIPMT 2002

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
Ques. 9AIPMT 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
Ques. 10AIPMT 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. 11AIPMT 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

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