Lesson: Chapter 13 — Electromagnetism and electromagnetic induction

The loudspeaker and a simple motor 1 of 4 Reset answers

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Question 1

What makes the coil of a loudspeaker vibrate?

A Heat from the current B A varying current in the magnet's field C Sound waves hitting it D A steady current

The right answer is the one marked above.

A varying current in the magnet's field. The force on the coil changes with the current, so the coil moves back and forth.

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