AB and CD are smooth parallel rails , seperated by a distance l , and inclined to the horiqontal at an angle O . A uniform magnetic field is normal to the plane of the rails . EF is a conductor of mass m , carrying a current i .For EF to be in equilibrium

a. Bil = mg tanO

b. Bil = mg sinO

c. Bil = mg cosO

d. equilibrium cannot be reached

The magnitude of force acting on the rod is equal to Bil.

For equilibrium, this should be equal to the component of the weight of the rod acting downwards along the incline.

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