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The circuit shown has resistors of equal resistance R. Find the equivalent resistance between A and B, when the key is closed.

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$\frac{15 R}{12}$

$\frac{13 R}{12}$

$\frac{11 R}{12}$

$\frac{R}{5}$

answer is C.

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Detailed Solution

A careful observation will reveal that one end of each resistor is connected to A and the other end of each resistor is connected to B. Hence, the resistors are in parallel. So $R_{e q} = R / 5.$

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