Three resistances P, Q, R each of 2 12 and an unknown resistance S form the four arms of aWheatstone bridge circuit. When a resistance of 6Omegais connected in parallel to S, the bridge gets balanced. What is the value of S?

Three resistances P, Q, R each of 2 12 and an unknown resistance S for

1.	Three resistances P, Q, R each of 2 12 and an unknown resistance S form the four arms of aWheatstone bridge circuit. When a resistance of 6Omegais connected in parallel to S, the bridge gets balanced. What is the value of S?
Answer» `3Omega` `6Omega` `1Omega` `2Omega` Solution :As P=Q=R=2`Omega` , HENCE for BALANCE resistance of 4th ARM of bridge should also be 2`Omega` . ` therefore ` Resultant resistance of parallel COMBINATION of`S Omega` and 6 `Omega`is `2Omega i.e.,1/2 = 1/S+ 1/6rArr S = 3 Omega`

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Three resistances P, Q, R each of 2 12 and an unknown resistance S form the four arms of aWheatstone bridge circuit. When a resistance of 6Omegais connected in parallel to S, the bridge gets balanced. What is the value of S?

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