The specific resistance and area of cross section of the potentiometer wire are `rho'` and `A` respectively. If a current `i` passes through the wire, its potential gradient will be

The specific resistance per unit area of cross section of a wire is equivalent to –

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 -

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 -

The potential gradient of the potentiometer wire depends on

As is the cross sectional area and rho is the specific resistance of a potentiometer wire. If I is the current passing through the potentiometer wire, then the potential gradient along the length of the wire is given by

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