Q. 64.0( 4 Votes )

# A circular loop of area 1 cm2, carrying a current of 10 A, is placed in a magnetic field of 0.1 T perpendicular to the plane of the loop. The torque on the loop due to the magnetic field isA. zeroB. 10–4 NmC. 10–2 NmD. 1 N m

Given a circular loop area =1cm �

Current =10A

Magnetic field strength =0.1 T

Given loop is circular. On each and every point of this circular loop there exists two forces. It will happen in case of circular loop only. The forces are equal but their magnitudes are opposite. Because of the opposite magnitudes they cancel each other. Then net force will be equal to zero. If we place any loop in magnetic field it definitely conducts current. In case of circular loop, the torque due to magnetic field on loop will be zero.

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