Question

A circular loop carrying current I is placed at right angles to a magnetic field. What is the net torque on the loop ?​

Answer 1

Answer:

The magnetic field is perpendicular to the plane of the paper. Let us consider two diametrically opposite elements as shown in the

figure.Since the direction of current is opposite, forces will cancel

each other due to

dF

=i(

dl

×

B

)

Similarly, all forces acting on the diametrically opposite elements will cancel out in pair. The net force on the loop will be zero.

The line of action for two forces acting on dl have the same line of action.

∴

dτ

=0

Hence, net torque acting on the loop is also zero.

The reason provided does not mention about the net force.

Answer 2

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