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If the current in the primary circuit of...

If the current in the primary circuit of a potentiometer wire is 0.2A, specific resistance of the material of wire `40xx10^(-8)Omega m` and area of cross-section of wire is `8xx10^(-7)m^2`. The potential gradient will be

A

`0.1V//m`

B

`0.001V//m`

C

`0.1V//cm`

D

`0.001V//cm`

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