Magnetic dipole moment of a bar magnet is `3 hat(i) "Am"^(2)` and the magnetic field intensity is `2 xx 10^(-5)` T in `y` direction calculate the torque on the magnet.

Options

A. `2 xx 10^(-5) hat(k) Nm`
B. `6 xx 10^(-5) hat(k) Nm`
C. `6 xx 10^(-5) hat(k) Nm`
D. `2 xx 10^(-5) hat(i) Nm`

Answer

B

Explanation

`6 xx 10^(-5) hat(k) Nm`
`overset(to)(tau) = overset(to)(M) xx overset(to)(B)`
`= 3 hat(i) xx 2 xx 10^(-5) hat(j) = 6 xx 10^(-5) hat(k) Nm`