A LEVEL PHYSICS (UK) ASSIGNMENT 14
A Level Physics Assignment Fourteen
ELECTROMAGNETIC EFFECTS
1. The simplified diagram below shows a DC electric motor. The split ring commutator consists of two copper semi-circular sections attached to either end of a coil. Fixed carbon brushes rub against and make electrical connections to the split ring commutator.
a. Does the coil rotate clockwise or counterclockwise? Explain what makes it rotate that way.
(4 marks)
b. When first switched on the current is large. As the coil turns faster, the current decreases. Explain why.
(4 marks)
(Total 8 marks)
Some materials within this document are republished with permission from Edexcel.
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