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Four resistors P, Q, R and S having res...

Four resistors P, Q, R and S having resistances `3Omega,3Omega,4Omega` and `6Omega` respectively, are arranged to form a Wheatstone's bridge. The value of the resistance with which S must be shunted in order to balance the bridge is

A

`12Omega`

B

`3Omega`

C

`4Omega`

D

`16Omega`

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