How do I find the polarity of a U-shaped electromagnet ?
Current flowing clockwise --> South Pole
Current flowing anticlockwise --> North Pole
However the direction of flow of current changes when seen from top as compared to bottom. From the examples, I find that one should view the direction from the bottom. So why is this so ?
In this image:
I believe the polarity at P is North and that at Q is South. Am I right ?
Is there any other method to determine the polarity of a U-shaped electromagnet ?
Answer
The current direction $I$ is from the positive terminal of the voltage source to the negative terminal.
Look end on along the axis of the electromagnet.
Clockwise current $I$ direction $\Rightarrow$ south pole
Anticlockwise current $I$ direction $\Rightarrow$ north pole
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