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PHYSICS

JAMB 2021 - Question 14

Physics 2021 JAMB Past Questions - Question 14: Which of these electrical instruments or machines does not rely on the magnetic effect of current for its working?

Choose the correct answers from the options given.

Which of these electrical instruments or machines does not rely on the magnetic effect of current for its working?

A: Carbon microphone

B: Telephone receiver

C: Moving-coil galvanometer

D: Dynamo

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Correct Answer

Explanation

The electrical instrument or machine that does not rely on the magnetic effect of current for its working is the capacitor. Unlike devices such as motors and transformers, capacitors store and release electrical energy without the need for magnetic fields.