Question

In a meter bridge, the balancing length from left is found to be $20cm$ when standard resistance of $1\Omega$ is in right gap. The value of unknown resistance is

• A. $0.25\Omega$
• B. $0.4\Omega$
• C. $0.5\Omega$
• D. $4\Omega$

Answer 1

The correct option is A $0.25\Omega$

For calculation of unknow resistance,
$\frac{x}{20}=\frac{1}{80}x=\frac{1}{4}=0.25\Omega$