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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 36:
The energy stored in an inductor of inductance 5mH when a current of 6A flows through it is
  • A 9.0 x 10<sup style='font-size: smaller;'>-3</sup>J
  • B 9.0 x 10<sup style='font-size: smaller;'>-2</sup>J
  • C 1.4 x 10<sup style='font-size: smaller;'>-2</sup>J
  • D 1.8 x 10<sup style='font-size: smaller;'>-3</sup>J
View Answer & Explanation
Question 37:
A steady current of 2A flows in a coil of emf 12V for 0.4s. A back emf of 3V was induced during this period. The stored energy in the loop that can be utilized is
  • A 9.6J
  • B 2.4J
  • C 12.0J
  • D 7.2J
View Answer & Explanation
Question 38:
In the diagram above, the ratio of he electric power dissipated in the 6Ω and the 3Ω resistor respectively is
  • A 2:1
  • B 2:2
  • C 1:3
  • D 1:2
View Answer & Explanation
Question 39:
A transformer is rated 240v. If the primary coil is 4000 turns and the secondary voltage 12v, determine the number of turns in the secondary coil.
  • A 200
  • B 100
  • C 250
  • D 150
View Answer & Explanation
Question 40:
If two inductors of inductances 3H and 6H are arranged in series, the total inductance is
  • A 9.0H
  • B 18.0H
  • C 0.5H
  • D 2.0H
View Answer & Explanation