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State and illustrate the rule used for finding the polarity of the faces of a circular coil. 

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For finding the polarity of the two faces of a current carrying circular coil, the following rule applies: 

When an observer, looking at the circular coil, finds the current to be flowing in the anti-clockwise direction, then face of the coil behaves like the N-pole of the equivalent magnet. On the other hand, if the’current is seen to flow in the clockwise direction, then face of the coil behaves like the S-pole of the equivalent magnet.

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