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

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

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Magnetism and Electromagnetism
The left hand rule correlates to

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

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