Q. In an experiment of meter bridge, a null point is obtained at the centre of the bridge wire. When a resistance of $10\ ohm$ is connected in one gap, the value of resistance in other gap is
A) $10\Omega$
B) $5\Omega$
C) $\frac{1}{5}\Omega$
D) $500\Omega$
Explanation
(a) Wheatstone bridge is balanced, therefore
$\frac{P}{Q} = \frac{R}{S}$ or $1 = \frac{10}{S} \Rightarrow S = 10\ ohm$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.