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AB and CD are fixed conducting smooth ra...

`AB` and `CD` are fixed conducting smooth rails placed in a vertical palne 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 shwn 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 constant acceleration

C

the rod will remain at rest

D

any of the above

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The correct Answer is:
D
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