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UPSC CDS Science Physics Questions Part 1

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Question : 53

Total: 105

A copper wire of radius r and length I has a resistance of R. A second copper wire with radius 2r and length I is taken and the two wires are joined in a parallel combination. The resultant resistance of the parallel combination of the two wires will be

5R
5
4
R
4
5
R
R
5

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