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Q.

In the circuit shown in figure, some potential difference is applied between A and B. The equivalent resistance between A and B is R 

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a

No current flows through the   5  Ω resistor           

b

R=12.5  Ω

c

R=185  Ω

d

R=15  Ω

answer is A, D.

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Detailed Solution

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Rearrangement of the circuit as shown in figure gives a balanced Wheatstone bridge, and no current flows through the  5 Ω resistor. It can thus be removed from the circuit.

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