Questions

AB and CD are fixed conducting smooth rails placed in a vertical plane and joined by a constant current source at its upper end. PQ is a conducting rod which is free to slide on the rails. A horizontal uniform magnetic field exists in space as shown. If the rod PQ is released from rest then,

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the rod PQ will move downward with constant acceleration

the rod PQ will move upward with constant acceleration

the rod will remain at rest

any of the above

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detailed solution

Correct option is D

Magnetic force F = IlB acts upwards and weight acts downwards.a=mg-Fm, depends upon mg and F.

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