WAEC Physics 2013 Objective — Question 43
Question 43 of 50 from the West African Examinations Council (WAEC) Physics 2013 Objective paper, with the correct answer and a full explanation.
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Which of the following devices works on the principle of electromagnetic induction?
- A. Carbon microphoneCorrect
- B. Electric heater
- C. Moving iron ammeter
- D. Simple d.c. motor
Explanation
Electromagnetic devices working on the principle of electromagnetic induction include the electric bell, telephone earpiece, magnetic relay, circuit breaker, and carbon microphone.
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