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Two unknown resistances are connected in...

Two unknown resistances are connected in two gaps of a meter-bridge. The null point is obtained at 40 cm from left end. A `30Omega` resistance is connected in series with the smaller of the two resistances, the null point shifts by 20 cm to the right end. The value of smaller resistance in `Omega` is

A

12

B

24

C

36

D

48

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TARGET PUBLICATION-CURRENT ELECTRICITY -Competitive Thinking
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