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AB and CD are fixed conducting smooth ra...

`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 in figure. If the rod `PQ` is released from rest then,

A

The rod PQ will move downward with constant acceleration

B

The rod PQ will move upward with constnat acceleration

C

The rod will move downward with decreasing accelration and finally acquire a constant velocity

D

Either A or B.

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The correct Answer is:
D
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