Magnetism and Electromagnetism
The force between two long parallel conductors is inversely proportional to

Radius of conductor
Distance between the conductors
Current in one conductor
Product of current in two conductors

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Magnetism and Electromagnetism
The left hand rule correlates to

Magnetic field, electric field and direction of force on a conductor
Current, induced e.m.f. and direction of force on a conductor
Current, magnetic field and direction of force on a conductor
Self induction, mutual induction and direction of force on a conductor

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