Question

In a meter bridge, the balancing length from theleft end (standard resistance of one ohm is in the right gap) is found to be 20cm. The value of the unknown resistance is

• A. 0.3$\Omega$
• B. 0.25$\Omega$
• C. 0.4$\Omega$
• D. 0.5$\Omega$

Answer 1

Answer: (B)

0.25$\Omega$

$\Rightarrow \frac{R}{1}=\frac{20}{100-20}$
$\Rightarrow R=\frac{20}{80}=\frac{1}{4}=0.25\Omega$