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Q.

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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a

10Ω,3Ω

b

20Ω,6Ω

c

30Ω,7.5Ω

d

40Ω,9Ω

answer is B.

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Detailed Solution

XY=8010080---(1)10x10+xY=5050--(2)

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