If a wire 30 cm long is extended to 30.5 cm by a force of…

If a wire 30 cm long is extended to 30.5 cm by a force of 300 N. find the strain energy of wire
  • A.
    0.75 J
  • B.
    7.50 J
  • C.
    75.00 J
  • D.
    750.00 J
Correct Answer: Option A
Explanation

Energy stored in a stretched wire (strain energy)
= average force x extension
= (1)/2 Fe
= (1)/2 x 300 N (30.5 – 30.0) x 10-2 m
= (300)/2 x 0.5 x 10-2 = 0.75J

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