Magnetism and Electromagnetism
A permeable substance is one

through which the magnetic lines of force can pass very easily
which is a good conductor
which is a strong magnet
which is a bad conductor

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Magnetism and Electromagnetism
The magnetomotive force is

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

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