The rigid conducting thin wire frame carries an electric current I and this frame is inside a uniform magnetic field `vec B` as shown in Fig. 1.146. Then,

Options

A. The net magnetic force on the frame is zero but the torque is not zero
B. The net magnetic force on the frame and the torque due to magnetic field are both zero.
C. the net magnetic force on the frame is not zero and the torque is also not zero.
D. None of these

Answer

b

Explanation

As we know that
`vecF=oint Ivec(dl)xxvecB and vectau=vecMxxvecB`