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 magnetomotive force is

The passage of magnetic field through an exciting coil
The voltage across the two ends of exciting coil
The sum of all currents embraced by one line of magnetic field
The flow of an electric current

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