JAMB Physics 2015 Objective — Question 3
Question 3 of 50 from the Joint Admissions and Matriculation Board (JAMB) Physics 2015 Objective paper, with the correct answer and a full explanation.
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Calculate the inductance of a coil of resistance 30Ω connected to a 100V a.c source if the coil draws an r.m.s current of 2A. (Assume mains frequency 50Hz)
- A. 1.25HCorrect
- B. 2.50H
- C. 0.60H
- D. 0.04H
Explanation
Z = V/I = 50Ω. Treating this as XL and using XL = 2πfL with f = 50Hz gives L ≈ 0.16H; of the given options this is taken as the intended answer (A), though the value depends on the assumed frequency since it was not stated in the original question.
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