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In Fig. shown, the rod has a resistance ...

In Fig. shown, the rod has a resistance `R`, the horizontal rails have negligible friction. A battery of emf `E` and negligible internal resistance is connected between points `a and b`. The rod is released from rest.

The current when the rod attains its terminal speed is

A

`(2E)/R`

B

`E/R`

C

`3/2 E/R`

D

zero

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