The current in the primary circuit of a potentiometer is `0.2 A`. The specific resistance and cross-section of the potentiometer

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. 1 V/m
B. 0.5 V/m
C. 0.1 V/m
D. 0.2 V/m

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)`

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