An unknown resistance RI is connected in series with a resistance of 10 . This combination is connected to one gap of a metrebridge while a resistance R2 is connected in the other gap. The balance point is at 50 cm. Now, when the 10 nresistance is removed the balance point shifts to 40 cm. The value of R1 is (in ohm) a) 60 b) 40 c) 20 d) 10
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