END RULE
This rule is used to find the polarity of the electromagnet.
EXPLANATION :
Take a solenoid of the electromagnet, if the current in the coil is counter clockwise direction, that end is north pole & if the direction is clockwise the end is south pole.
LENZ LAW
When an emf is induced in the circuit electromagnetically the current setup always opposes the motion of change in current which produces it.
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