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Saturday, 15 August 2026
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Physics Past Questions and Answers

Topic: (a) Electromagnetic Induction

Jamb Physics Questions - (a) Electromagnetic Induction

Question 41:
The main purpose of the transformer in an a.c radio set is to?
  • A Increase power to the radio
  • B Step up the voltage
  • C Convert energy from a.c to d.c
  • D Step down the voltage
View Answer & Explanation
Question 42:
Lenz's law is a law of conservation of
  • A Electric charge
  • B Electric current
  • C Energy
  • D Momentum
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Question 43:
Given the inductor of inductance 5mH, 10mH and 20mH connected in series, the effective inductance is
  • A 0.35mH
  • B 3.50mH
  • C 2.90mH
  • D 35.0mH
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Question 44:
A band of 500 rectangular loops of wire of area 20 cm by 20 cm, encloses a region of magnetic field which charges from 1.0T to 0.4T within 5 seconds, calculate the induced e.m.f.
  • A 5.60 v
  • B 24.00 v
  • C 0.24 v
  • D 2.40 v
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Question 45:
Two inductors of inductances 5 mll and 15 mll are connected in series and a current of 5A flows through them. the total energy stored in the inductor is
  • A 500.0J
  • B 250.0J
  • C 62.5J
  • D 50.0J
  • E No correct option
View Answer & Explanation