Question

In a metre bridge, the null point is found to be at distance of 33.33 cm from left end $A$. The resistance connected in right gap is $12\Omega$. What is unknown resistance in left gap?

• A. $24\Omega$
• B. $18\Omega$
• C. $36\Omega$
• D. $6\Omega$

Answer 1

The correct option is D $6\Omega$

In balanced condition of wheatstone bridge.


$\frac{R}{S}=\frac{33.33}{66.66}=\frac{1}{2}$
$\frac{R}{12}=\frac{1}{2}\therefore R=6\Omega$