Question

The figure shows an infinite long current carrying wire out of the plane of paper (shown by O). A current carrying loop ABCD is placed as shown. The loop

• A. Experiences a net force
• B. Experiences no torque
• C. Turns clockwise as seen by a an observer at O position
• D. Turns a anticlockwise as seen by an observer at O position

Answer 1

The correct option is C Turns clockwise as seen by a an observer at O position

Force on part DA and BC is zero since $i\overline{l}\times \overline{B}=0$
and in part AB it will go upwards and at DC it go downwards.
So, by seeing it from O position it turns clockwise.