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

`10^(-2)V//m`

`10^(-1)V//m`

`3.2xx10^(-2)V//m`

`1V//m`

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