State and explain the Clock face rule for determining the polarities of a circular wire carrying current.

Clock face rule: This rule is used to determine the polarity of two faces of a current-carrying circular coil. 

According to clock face rule, if we look at one face of the circular wire (or coil) through which a current is passing, we have the following conclusions:

1. If the current around the face of the circular wire (or coil) flows in the Clockwise direction, then that face of the circular wire will be South pole (S-pole).

2. If the current around the face of the circular wire (or coil) flows in the Anticlockwise direction, then that face of the circular wire will be North pole (N-pole).

A current-carrying circular wire (coil) behaves like a thin disc magnet with one face being the north pole and the other faces the south pole.

If the direction of current in the front face of a circular wire is clockwise, then the direction of current in the back face of this circular wire will be anticlockwise, and

If the direction of current in the front face of a circular wire is anticlockwise, then the direction of current in the back face of this circular wire will be clockwise.