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The current in the primary circuit of a ...

The current in the primary circuit of a potentiometer is `0.2 A`. The specific resistance and cross-section of the potentiometer wire are `4xx10^(-7)` ohm meter and `8xx10^(-7)m^(2)` respectively. The potential gradient will be equal to -

A

`0.2 v//m`

B

`1 v//m`

C

`0.5 v//m`

D

`0.1 v//m`

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The correct Answer is:
D
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