Question

The potentiometer consists of a wire of length $4m$ and resistance $10\Omega$. It is connected to a cell of e.m.f $2V$. The potential difference per unit length of the wire will be:

• A. $10V/m$
• B. $5V/m$
• C. $2V/m$
• D. $0.5V/m$

Answer 1

The correct option is D $0.5V/m$

Potential difference $E=2V$

Length $L=4m$

Potential difference per unit of length $=\frac{E}{L}=\frac{2}{4}$

$=0.5V/m$

Answer-(D)