Two unknown resistrance X and Y are connected to left and right gaps of a meter bridge and the balancing point is obtained at 80 cm from left. When a 10Ω resistance is connected in parallel to ‘x’, the balance point is 50 cm from left. The values of X and Y respectively are

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40Ω,9Ω

30Ω,7.5Ω

20Ω,6Ω

10Ω,3Ω

answer is B.

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Detailed Solution

XY=80100−80---(1)10x10+xY=5050−--(2)

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