Q. For what value of unknown resistance $X,$ the potential difference between $B$ and $D$ will be zero in the circuit shown in the figure
A) $4\ \Omega$
B) $6\ \Omega$
C) $2\ \Omega$
D) $5\ \Omega$
Explanation
(b) For balanced Wheatstone bridge $\frac{P}{Q} = \frac{R}{S}$
$\Rightarrow \frac{12}{(1/2)} = \frac{x + 6}{(1/2)} \Rightarrow x = 6\Omega$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.