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A potentiometer wire has resistance 40Om...

A potentiometer wire has resistance `40Omega` and its length is 10m. It is connected by a resistance of `760Omega` in series if emf of battery is 2V then potential gradient is:-

A

`0.5xx10^(-6) V//m`

B

`1xx10^(-6)V//m`

C

`1xx10^(-2)V//m`

D

`2xx10^(-6)V//m`

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