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Moving Charges and Magnetism · Question 86

AIPMT 2002MCQMedium📈 Topic in 25% papers+4−1
1

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

Answer

(3) 4B

Solution

Field at the centre of a coil: B = 0 nI2r

Same wire of length l: one turn l = 2 r; two turns l = 2 2 r' r' = r2

B' = 0(2)I2(r/2) = 4 0 I2r

B' = 4B

Answer: (3)

AIPMT 2002

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2

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
3

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
4

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
5

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

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

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