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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 velocity of the rod as function of time is

A

`E/(Bl) (1-e^(-t//tau))`

B

`E/(Bl) (1+e^(-t//tau))`

C

`3/2 E/(Bl) (1-e^(-t//tau))`

D

`E/(2Bl) (1-e^(-t//tau))`

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