Magnetism and Electromagnetism
The magnetomotive force is

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

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Magnetism and Electromagnetism
When an iron piece is placed in a magnetic field

the magnetic lines of force will bend away from their usual paths in order to go away from the piece
the magnetic field will not be affected
the iron piece will break
the magnetic lines of force will bend away from their usual paths in order to pass through the piece

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