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Question

A wire 4 m long and 0.3 mm diameter is stretched by a force of 100N. If the extension in the wire is 0.3 mm, calculate the potential energy stored in the wire.


  1. 15J

  2. 25 J

  3. 15x10-3J

  4. 25x10-3J


Solution

The correct option is C

15x10-3J


U=12 (stress) (strain) (volume)

=12×(Force) (elongation)

  =12×100×3×104

=15×103J

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