NEET Physics - New - Moving Charges and Magnetism

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Question - 1

The magnetic field at a perpendicular distance of 2 cm from an infinite straight current carrying conductor is 2x10-6 T. The current in the wire is

  • A 0.1 A
  • B 0.2 A
  • C 0.4 A
  • D 0.8 A

Question - 2

A positive charge is moving towards an observer. The direction of magnetic induction lines is 

  • A clockwise
  • B anticlockwise
  • C right
  • D left

Question - 3

If a copper wire carries a direct current, the magnetic field associated with the current will be

  • A only outside the wire
  • B only inside the wire
  • C both inside and outside the wire
  • D neither inside nor outside the wire

Question - 4

Current carrying wire produces

  • A Only electric field
  • B Only magnetic field
  • C Both electric and magnetic field
  • D None of the above

Question - 5

A circular coil of n turns and radius r carries a current I. The magnetic field at the centre is 

  • A \(\frac { { \mu }_{ o }nI }{ r } \)
  • B \(\frac { { \mu }_{ o }nI }{ 2r } \)
  • C \(\frac { { 2\mu }_{ o }nI }{ r } \)
  • D \(\frac { { \mu }_{ o }nI }{ 4r } \)

Question - 6

A thin ring of radius R metre has charge q coulomb uniformly spread on it. The ring rotates about its axis with a constant frequency of f revolutions/s. The value of magnetic field induction in Wb/m2 at the centre of the ring is 

  • A \(\frac { { \mu }_{ o }qf }{ 2\pi R } \)
  • B \(\frac { { \mu }_{ o }q }{ 2\pi fR } \)
  • C \(\frac { { \mu }_{ o }q }{ 2fR } \)
  • D \(\frac { { \mu }_{ o }qf }{ 2R } \)

Question - 7

A coil of wire has an area of 600 sq. cm and has 500 turns. If it carries 1.5 A current, its magnetic dipole moment is 

  • A 5 Am2
  • B 15 Am2​​
  • C 30 Am2
  • D 45 Am2​​​​​​

Question - 8

Ampere's circuital law can be derived from

  • A Ohm's law
  • B Biot-Savart's law
  • C Kirchhoff's law
  • D Gauss's law

Question - 9

A circular coil carrying current behaves as a

  • A bar magnet
  • B horse shoe magnet
  • C magnetic shell
  • D solenoid

Question - 10

A long solenoid has n turns per metre and current I A is flowing through it. The magnetic field induction at the ends of the solenoid is 

  • A zero
  • B \({ \mu }_{ o }nI/2\)
  • C \({ \mu }_{ o }nI\)
  • D \(2{ \mu }_{ o }NI\)
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