When a current carrying coil is placed in a uniform magnetic field with its magnetic moment anti parallel to the field , then

Options

A. Torque on it is maximum
B. Torque on it is minimum
C. Potential energy of the loop is maximum
D. Potential energy of the loop is minimum

Answer

B, C

Explanation

Option (B) should be torque is minimum.
`tau=barmxxbarB=mB sin theta=mB sin 180^(@)=0`, `U=-m B cos theta=-mB cos 180^(@)=mB`
`:.tau` is minimum & U is maximum.