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in Current electricity by (30 points)
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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

\(\frac{3R}{2} \)

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