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Q. 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

  • (A) 5 R
  • (B) 5 R/4
  • (C) 4 R/5
  • (D) R/5
  • Correct Answer - Option(D)
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