Magnetism and Electromagnetism
The initial permeability of an iron rod is

The permeability almost in non-magnetised state
The highest permeability of the iron rod
The lowest permeability of the iron rod
The permeability at the end of the iron rod

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

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

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