Magnetism and Matter - Result Question 6

9. A bar magnet, of magnetic moment M, is placed in a magnetic field of induction B. The torque exerted on it is

(a) MB

(b) MB

(c) M×B

(d) B×M

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Answer:

Correct Answer: 9. (c)

Solution:

  1. (c) We know that when a bar magnet is placed in the magnetic field at an angle θ, then torque acting on the bar magnet (τ)

=MBsinθ=M×B.

The direction of torque (τ) is perpendicular to the plane containing M and B and is given by right hand screw rule.



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