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Three resistances P,Q,R each of 2Omega ...

Three resistances P,Q,R each of 2`Omega` and unknown resistance S form the four arms of a Wheatstone bridge circuit. When a resistance of 6`Omega` is connected in parallel to S the bridge gets balanced.What is the value of S ?

A

1`Omega`

B

2`Omega`

C

3`Omega`

D

6`Omega`

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