Magnetism and Electromagnetism
In a simple magnetic field the strength of magnet flux

first increases and then decreases till it becomes zero
increases continuously from initial value to final value
is constant and has same value in energy part of the magnetic field
decreases continuously from initial value to final value

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Magnetism and Electromagnetism
The magnetomotive force is

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
The flow of an electric current

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