Magnetism and Electromagnetism
For a given wire-wound core, an increase in current through the coil

Causes no change in flux density
Reverses the flux lines
Decreases the flux density
Increases the flux density

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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
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

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