Question

A potentiometer wire has length 10 m and resistance 10$\Omega$. It is connected to a battery of
EMF 11 volt and internal resistance 1 $\Omega$, then the potential gradient in the wire is:

• A. 10 V/m
• B. 1 V/m
• C. 0.1 V/m
• D. none

Answer 1

The correct option is B 1 V/m

Total resistance $=10+1=11\Omega$

Current in the circuit $=\frac{11}{11}=1A$

Potential across the wire $=current\times resistance=10V$

Since, Potential gradient is equal to potential per meter

Potential Gradient $=\frac{10}{10}=1V/m$

Therefore, B is correct option.