A small coil C with turns is mounted on one end of a balance beam and introduced between the poles of an electromagnet as shown in fig. The area of the coil is , the length of the right arm of the balance beam is . When there is no current in the coil the balance is in equilibrium. On passing a current through the coil, equilibrium is restored by putting an additional weight of mass mg on the balance pan. Find the magnetic induction field (in terms of between the poles of the electromagnet, assuming it to be uniform :

Updated on : 2022-09-05
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Correct option is A)

Torque on the loop due to magnetic field
Torque due to extra weight added
Equating both torques,

Hence, the magnetic field in units of is 4.

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