A copper wire of radius r and length l has a resistance of R. A second copper wi

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A copper wire of radius r and length l has a resistance of R. A second copper wire with radius 2r and length l 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

Options:

A . 5 R

B . 5 R/4

C . 4 R/5

D . R/5

Answer: Option D

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