A bar magnet of magnetic moment `vec(M)` is placed in a magnetic field of induction `vec(B)` . The torque exerted on it is

Options

A. `vec(M) xx vec(B)`
B. `-vec(M) xx vec(B)`
C. `-vec(M).vec(B)`
D. `vec(M).vec(B)`

Answer

A

Explanation

Torque `vec(tau)= vec(M) xx vec(B)`