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Sunday, 21 June 2026
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Physics Past Questions and Answers

Topic: A.C. and D.C generators

Jamb Physics Questions - A.C. and D.C generators

Question 1:
Fig 8 shows a current I flowing in a copper wire situated in a magnetic field existing between the pole-pieces of a horse-shoe magnet.
Which of the following statements is correct?
  • A The wire will experience a force in the direction into the paper
  • B The wire will experience a force in the direction out of the paper
  • C The wire will vibrate in a direction into and out of the paper
  • D The wire will move in the direction of the field i.e toward the s-pole
  • E The wire will not move because it is made of copper which is non magnetic
View Answer & Explanation
Question 2:
Which of the following is NOT directly associated with direct current (DC)?
  • A A dry cell
  • B A moving coil galvanometer
  • C A transformer
  • D A lead- acid accumulator
  • E A commutator
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Question 3:
A closed coil of wire is placed near a magnet. The magnet lies along the axis of the coil. Under which of the following conditions would there be no current in the coil?
  • A When the coil is moved toward the stationary magnet
  • B When the coil is moved away from the stationary magnet
  • C When the coil is held stationary but the magnet is moved towards the coil
  • D When both the coil and the magnet are held stationary
  • E When the coil is held stationary but the magnet is moved away from the cell
View Answer & Explanation
Question 4:
On which of the following does the operation of a moving coil ammeter depend? i. Electromagnetic induction ii. Force on a carrying-current conductor iii. Magnetic effect of an electric current
  • A I only
  • B Ii only
  • C Iii only
  • D Ii and iii only
  • E I,ii and iii
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Question 5:
The principle of operation of an induction coil is based on
  • A Ohm's law
  • B Amphere's law
  • C Faraday's law
  • D Columbs law
View Answer & Explanation