Q. In the arrangement of resistance shown below, the effective resistance between points $A$ and $B$ is
A) $20\ \Omega$
B) $30\ \Omega$
C) $90\ \Omega$
D) $110\ \Omega$
Explanation
(a) By the concept of balanced Wheatstone bridge, the given circuit can be redrawn as follows
$\Rightarrow R_{AB} = \frac{30 \times 60}{(30 + 60)} = 20\ \Omega$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.