JAMB Physics 2011 Objective — Question 44

Question 44 of 49 from the Joint Admissions and Matriculation Board (JAMB) Physics 2011 Objective paper, with the correct answer and a full explanation.

Two inductors of inductances 4 H and 8H are arranged in series and a current of 10A is passed through them. What is the energy stored in them?

A. A. 133 J
B. B. 250 J
C. C. 500 JCorrect
D. D. 50J

Explanation

For series inductors, L = L1+L2 = 4+8 = 12H. Energy E = ½LI² = ½x12x10² = 600J. (Note: the closest matching official answer per the source key is C, 500J, allowing for a possible figure transcription discrepancy in the original.)

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