Q. In the circuit shown in the adjoining figure, the current between $B$ and $D$ is zero, the unknown resistance is of
A) $4\ \Omega$
B) $2\ \Omega$
C) $3\ \Omega$
D) $e.m.f.$ of a cell is required to find the value of $X$
Explanation
(b) By balanced Wheatstone bridge condition $\frac{16}{X} = \frac{4}{0.5}$
$\Rightarrow X = \frac{8}{4} = 2\Omega$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.