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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

(a) the rod `PQ` will move downward with constant acceleration

B

(b) the rod `PQ` will move upward with constant acceleration

C

( C) the rod will remain at rest

D

(d) any of the above

Text Solution

Verified by Experts

The correct Answer is:
D
( d) magnetic force `F = IlB` acts upwards and weight acts down wards.
`a = (mg - F)/(m)`, depends upon mg and `F`.
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