JAMB Physics 2010 Objective — Question 11

Question 11 of 50 from the Joint Admissions and Matriculation Board (JAMB) Physics 2010 Objective paper, with the correct answer and a full explanation.

11. If a wire 30 cm long is extended to 30.5 cm by a force 300 N. Find the strain energy of the wire. A. 7.50 J B. 750.00 J C. 75.00 J D. 0.75 J

A. 7.50 J
B. 750.00 J
C. 75.00 J
D. 0.75 JCorrect

Explanation

Length L1=30cm, L2=30.5cm, F=300N, extension = L2-L1=0.5cm=0.005m. Energy = 1/2 Fe = (1/2 x 300 x 0.005)J = 0.75J.

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