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If a wire is stretched to make it 0.1 % longer, its resistance will :

Options

  1. Aincrease by 0.2 %
  2. Bdecrease by 0.2 %
  3. Cdecrease by 0.05 %
  4. Dincreases by 0.05 %

Correct answer

A. increase by 0.2 %

Step-by-step solution

R ^2 (for a given volume) R R %= 2 % Thus when wire is stretched by 0.1 % resistance increases by 0.2 %

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