In the given diagram, when the switch is pressed, the polarity of end $A$ will be [[1]].

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Detailed Solution

When the switch is pressed, the polarity of end

A

will be South.
When the switch is pressed, current will flow clockwise at end A because it has a plus or positive end; thus, this end will behave like the South Pole.
The clock face rule states that “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.”
The north-south polarities of an electromagnet can be easily determined using the Clock face rule, because this rule states that "When an observer notices current flowing in an anti-clockwise direction at one face of the coil, that face will behave like the North Pole. If, on the other hand, the observer discovers that the current is flowing clockwise, the face of the coil will behave like the South Pole ".

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