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74 An unknown resistance R is connected in series with resistance 109 When the combination...

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74 An unknown resistance R is connected in series with resistance 109 When the combination is connected to left gap of a metre bridge and R is connected to right gap balance point from left end is at 50 cm When the 10 Q is removed the balance point shifts to 40 cm The value of R is 1 200 3 60 Q 2 10 Q 4 40 Q

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