The resistivity of potentiometer wire is...

The resistivity of potentiometer wire is `10^-7` ohm m and its area of cross-section is `10^-6m^2`. When a current I = 0.1. A flows through the wire, its potential gradient is

`10^-2Vm^-1`

`10^-4Vm^-1`

`0.1Vm^-1`

`10 V m^-1`

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