A wire has resistance R. If its length is doubled while its cross-sectional area remains unchanged, its new resistance will be

Options

  • A. R/2
  • B. R
  • C. 2R
  • D. 4R
  • E. None of the above

Correct Answer (Detailed Explanation is Below)

C. 2R

Detailed Explanation

Resistance R = rho L/A. With length doubled and area unchanged, resistance becomes 2R.
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