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Moving Charges and Magnetism · Question 84

AIPMT 2002MCQEasy📈 Topic in 12% papers+4−1
1

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.

Answer

(1) high resistance in series with galvanometer

Solution

As per NCERT, a galvanometer is converted into a voltmeter by connecting a large resistance R in series with it.

The voltmeter then has a very high resistance and draws negligible current from the circuit.

R = VIg - G

Answer: (1)

AIPMT 2002

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2

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
3

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
4

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
5

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
6

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
7

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

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

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