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The resistivity of a potentiometer wire ...

The resistivity of a potentiometer wire is `40xx10^(-8)Omega-m` and its area of cross section is `8xx10^(-6)m^(2)`. If 0.2 A current is flowing through the wire the potential gradient will be

A

`10^(-2)` volt/m

B

`10^(-1)` volt/m

C

`3.2 xx 10^(-2)` vol/m

D

1 vol/m

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The correct Answer is:
A
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