A 2 volt battery, a `15 Omega` resistor and a potentiometer of `100 cm` length, all are connected in series. If the resistance resistance of potentiometer wire is `5 Omega`, then the potential gradient of the potentiometer wire is

Options

A. `0.05 Vm^(-1)`
B. `0.5 Vm^(-1)`
C. `0.01 Vm^(-1)`
D. `0.1 Vm^(-1)`

Answer

C

Explanation

Potential gradient` x=(3)/((R+R_(h)+r))*(R)/(L)`
`implies x=(2)/((90+10))xx(10)/(2)=0.01 Vm^(-1)`