Question

length of potentiometer wire is $4m$. its resistance is $2\Omega$ and the current passing through its potential gradient on a wire is

• A. $0.5V/m$
• B. $1V/m$
• C. $2V/m$
• D. $0.1V/m$

Answer 1

The correct option is A $0.5V/m$

Given,

Length of wire is $4m$

Resistance of wire is $2\Omega$

We know that potential gradient (K) is

$k=\frac{V}{L}$

$k=\frac{IR}{L}$

Substitute value of $R$ and$L$ in above equation

$k=\frac{I\times 2}{4}=0.5Iv/m$

Hence, potenetial gradient os $0.5v/m$ times of current passing through wire

Option (A) is correct option.