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, (PQ have mass, 
is constant current through AC)
Text Solution
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It the magnitude of 
is very large such that force due to magnetic field on PQ exceeds its weight then it will move upwards otherwise it will move downwards.
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