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With resistances P and Q in the left and...

With resistances P and Q in the left and the right gap respectively of a metre bridge, the null point divides the wire in the ratio `3:4`. When P andQ are increased by` 20 Omega`each,the null point divides the wire in the ratio `5:6`. The values of P and Q are

A

`30 Omega ,40 Omega`

B

`20 Omega ,40 Omega`

C

`30 Omega ,80 Omega`

D

`20 Omega ,20 Omega`

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