ELECTRIC MOTORS AND ELECTROMAGNETIC INDUCTION

1 mark · Easy

Which one of the following changes would NOT increase the turning force produced by a simple electric motor?

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Correct option: Use a steel core instead of a soft iron core.

Common mistakes: Increase the number of turns; Increase current

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Marking points

B1 · 1 mark · Selects steel core answer.

Worked solution

A steel core will not increase the turning force because steel is not easily magnetised and demagnetised. The others all increase the force.