Lesson: Chapter 13 — Electromagnetism and electromagnetic induction

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Question 1

Why does a transformer not work with a steady direct current?

A A steady current makes a steady field, which induces nothing B The iron core melts C The coils are not joined D DC is too weak

The right answer is the one marked above.

A steady current makes a steady field, which induces nothing. Induction needs a changing field, as activity 13.6 showed.

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