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A potentiometer has uniform potential gr...

A potentiometer has uniform potential gradient. The specific resistance of the material of the potentiometer wire is `10^-7` ohm metre and the current passing through it is 0.1 ampere. Cross-section of the wire is `10^-8 m^2`. The potential gradient along the potentiometer wire is

A

`10^-8 Vm^-1`

B

`10^-2 Vm^-1`

C

`10^-6 Vm^-1`

D

`10^-4 Vm^-1`.

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