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Moving Charges and Magnetism · Question 77

AIPMT 2005MCQEasy📈 Topic in 0% papers+4−1
1

A very long straight wire carries a current I. At the instant when a charge +Q at point P has velocity v, as shown, the force on the charge is [figure]

  1. along Oy
  2. opposite to Oy
  3. along Ox
  4. opposite to Ox

Answer

(1) along Oy

Solution

Take x to the right, y upward and z out of the page.

Current I is upward and P is to its right B at P is into the page, B = -B k

v = v i

F = Q( v B) = QvB( i (- k)) = QvB j

The force is along Oy.

Answer: (1)

AIPMT 2005

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2

An electron moves in a circular orbit with a uniform speed v. It produces a magnetic field B at the centre of the circle. The radius of the circle is proportional to

  1. B/v
  2. B/v
  3. v/B
  4. v/B
AIPMT 2005
3

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
AIPMT 2005
4

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
AIPMT 2004
5

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
AIPMT 2004
6

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
AIPMT 2003
7

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
AIPMT 2003
8

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.
AIPMT 2002
9

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 )
AIPMT 2002
10

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
11

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

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