The resistivity of a potentiometer wire ...

The resistivity of a potentiometer wire is, if the area of cross section of the wire is `4cm^(2)`. The current flowing in the circuit is 1A, the potential gradient is 7.5 v/m _______

`3xx10^(-3)Omega-m`

`2xx10^(-6)Omega-m`

`4xx10^(-2)Omega-m`

`5xx10^(-4)Omega-m`

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