Magnetism and Electromagnetism
The two conductors of a transmission line carry equal current I in opposite directions. The force on each conductor is

proportional to 7
proportional to X
inversely proportional to I
proportional to distance between the conductors

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Magnetism and Electromagnetism
The left hand rule correlates to

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

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