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A potentiometer has a uniform wire of le...

A potentiometer has a uniform wire of length 10 m and resistance `5 Omega`. The potentiometer is connected to an external battery of e.m.f. 10V and negligible internal resistance and an external resistance of `995 Omega` in series.The potential gradient along the wire is

A

1 mV/m

B

5 mV/m

C

0.1 mV/m

D

4 mV/cm

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