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. `0.005 V//cm`
B. `0.05 V//cm`
C. `0.02 V//cm`
D. `0.2 V//cm`

Answer

A

Explanation

(a) Potential gradient `= (e)/((R R_(h) + r)) = (R )/(L)`
`= (2)/((15 + 5 + 0)) xx (5)/(1) = 0.5 (V)/(m) = 0.005 (V)/(cm)`