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P, Q, R and S are four wires of resistances 3, 3, 3 and 4 Ω respectively. They are connected to form the four arms of a wheat-stone bridge circuit. Th
Question

P, Q, R and S are four wires of resistances 3, 3, 3 and 4 Ω respectively. They are connected to form the four arms of a wheat-stone bridge circuit. The resistance with which S must be shunted in order that the bridge may be balanced is __________.
Fill in the blank with the correct answer from the options given below.

A.

14 Ω

B.

12 Ω

C.

15 Ω

D.

7 Ω

Correct option is B

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