Resistance between AB

Question

Answer 1

The Given circuit is a balanced wheatstone bridge. So, the current in R is 0. 

Now, R and 2R are in series in the upper branch connected across AB. 

Their equivalent resistance = 2R + R = 3R 

Similarly the equivalent resistance of the lower branch = 3R

Equivalent resistance of entire circuit, R

= \(\frac{3R}{2} \)