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Physics Past Questions and Answers

Topic: (a) Electromagnetic Induction

Jamb Physics Questions - (a) Electromagnetic Induction

Question 51:
The primary coil of a transformer has N turns and is connected to a 120 V a.c. power line. If the secondary coils has 1 000 turns and a terminal voltage of 1 200 volts, what is the value of N?
  • A 120
  • B 100
  • C 1 000
  • D 1 200
View Answer & Explanation
Question 52:
Energy losses through eddy currents are reduced by using
  • A Low resistance wires
  • B Insulated soft iron wires
  • C Few turns of wires
  • D High resistance wires
View Answer & Explanation
Question 53:
Capacitors are used in the induction coil to
  • A Control circuits
  • B Prevent distortion of electric fields
  • C Prevent electric sparks
  • D Dissipate energy
View Answer & Explanation
Question 54:
An electric device is rated 2000W, 250V. Calculate the maximum current it can take
  • A 9A
  • B 8A
  • C 7A
  • D 6A
View Answer & Explanation
Question 55:
Induced emfs are best explained using
  • A Ohm's law
  • B Faraday's law
  • C Colomb's law
  • D Lenz's law
View Answer & Explanation