Question

There is a current I flowing in a clockwise direction in a square loop of wire that is in the plane of the paper. If the magnetic field B is toward the right, and if each side of the loop has length L, then the net magnetic torque acting on the loop is:

Answer 1

Answer:

Explanation:

The magnetic moment of the coil  M = current x area of loop

= I x L x L

M = L² I .

Magnetic field = B

Torque = M x B

= MB sinθ where θ is angle between M and B . Direction of M is perpendicular to face of loop

Torque  = MB sin90

= MB

=  L² I B .