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The resistance in the first and the seco...

The resistance in the first and the second arms of a Wheatstone bridge are `P=10Omega andQ=20Omega `. The third and the fourth arm reistance R and S are so chosen that the bridge is balanced . Now , R is kept fixed , but P and Q are interchnged . The new value of the fourth arm resistance at balance is x% of the old value of S . The value of x is

A

25

B

50

C

200

D

400

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The correct Answer is:
A
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