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

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

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

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 go away from the piece
the magnetic lines of force will bend away from their usual paths in order to pass through the piece

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