Q. In a meter 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
A) $0.8\ \Omega$
B) $0.5\ \Omega$
C) $0.4\ \Omega$
D) $0.25\ \Omega$
Explanation
(d) $\frac{X}{1} = \frac{20}{80} \Rightarrow X = \frac{1}{4}\Omega = 0.25\Omega$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.