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Magnetic Effects of Electric Current
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30/07/2021 2:34 pm
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The directions of current flowing in the coil of an electromagnet at its two ends X and Y are as shown below:
(a) What is the polarity of end X?
(b) What is the polarity of end Y?
(c) Name and state the rule which you have used to determine the polarities.
1 Answer
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30/07/2021 2:36 pm
(a) End X is S-pole (because current flows in clockwise direction).
(b) End Y is N-pole (because current flows in anticlockwise direction).
(c) Clock face rule: Looking at the face of a loop, if the current around that face is in anticlockwise direction, the face has north polarity, while if the current at that face is in clockwise direction, the face has south polarity.