Physics · May / June 2020 · Paper 12 · Question 39
5054The d.c. motor
A rectangular current-carrying coil is pivoted between the poles of an electromagnet. Which action does not, on its own, increase the size of the turning effect exerted on the coil?
- Aincreasing the current in the coils of the electromagnet
- Bincreasing the current in the rectangular coil
- Creversing the current in the electromagnet
- Dincreasing the number of turns on the rectangular coil
As printed in the paper
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Correct answer: C. reversing the current in the electromagnet
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