Lesson: Chapter 13 — Electromagnetism and electromagnetic induction

The microphone and the bicycle dynamo 3 of 4 Reset answers

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Question 3

Why is the coil of a bicycle dynamo wound on soft iron?

A To gather the field lines through the coil and give a larger emf B To insulate the coil C To make the dynamo lighter D To stop the current

The right answer is the one marked above.

To gather the field lines through the coil and give a larger emf. More field lines link the coil, so their change induces more emf.

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