How could you tell whether an electromagnet lifts more clips because it has more turns or because its current changed? Design a fair investigation into coil turns or current, repeat a measurement and use the results to support a conclusion.
Pupils try “Test the number of turns”. Includes the editable PowerPoint, a 50-minute lesson plan and a printable pupil sheet with equipment, instructions, example evidence and worked teacher answers.
KS3 physics for ages 11–14. Part of the magnetism and electromagnets sequence.
The download includes the electromagnet maths challenge used to analyse the supplied investigation data.
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