The north-south polarities of an electromagnet can be found easily by using:
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Solution
Clock face rule:
The clock face rules clearly state whenever an investigator looks somewhere at the face of the coil and notices that the current is flowing anti-clockwise, the countenance of the coil acts as that of the north pole.
When the current flows clockwise, the coils function like the south pole.
The north-south polarities of an electromagnet can be found easily by using the clock face rule.
