In a metre bridge, the balancing length from the left end (standard resistance of one ohm is in the

Question

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

Professor PC Thomas Classes · Answer

(d) : Metre bridge works on the principle of Wheatstone's bridge.\ $	herefore \frac{P}{Q}=\frac{l}{100-l}$ or, $P=\frac{l}{100-l} 	imes Q=\frac{20}{80} 	imes 1=0.25 \Omega$.