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Magnetic Field in a Coil Carrying Current

If a coil carrying current is suspended by thin elastic long conductors, it will align itself as the compass needle, i.e., one end of the coil will point in the north direction and the other end will point towards the south.

The polarity of the faces of the coil depends on the direction of current and is obtained by a rule known as "The Clock Rule"According to this rule "When an observer, looking at the face of the coil, finds the current to be flowing in the anti-clockwise direction, then the face of the coil will behave like the north pole. While if the current is in the clockwise direction, the face of the coil will behave like South Pole.

current direction determines polarity of coils

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