Magnetism and Electromagnetism
A permeable substance is one

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

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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
decreases continuously from initial value to final value
is constant and has same value in energy part of the magnetic field

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