The current in the primary circuit of potentiometer is 0.2A. The specific resistance and cross-section of the potentiometer wire are `4xx10^(-7)Omegam` and `8xx10^(-7)m^2` respectively . The potential gradient will be equal to

Options

A. `0.2V//m`
B. `1V//m`
C. `0.3V//m`
D. `0.1V//m`

Answer

D