Q.

The effective resistance between points P and Q of the electrical circuit shown in the figure is

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a

b

c

d

answer is A.

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Detailed Solution

In a circuit, any circuit element placed between points at the same potential can be removed, without affecting the rest of the circuit. Here, by symmetry, points A, B and C are at same potential, for any potential difference between P and Q.The circuit can therefore be reduced as shown belowEffective resistance
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