Standard Science Primary 3 Interactions

An electromagnet is used in a scrap yard to lift iron beams. Which of the following would NOT increase the strength of the electromagnet?

A Using a thicker iron core.
B Increasing the number of coils around the iron core.
C Using a plastic core instead of an iron core.
D Increasing the number of batteries in the circuit.
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Worked Solution

Step 1: Electromagnet strength depends on current and the number of coils. Step 2: A magnetic material like iron as a core concentrates the magnetic field. Step 3: Plastic is non-magnetic and would not help strengthen the electromagnet.

Correct answer: Using a plastic core instead of an iron core.

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