Magnetism and Electromagnetism
For a given wirewound core, an increase in current through the coil

reverses the flux lines
causes no change in flux density
increases the flux density
decreases the flux density

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

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
first increases and then decreases till it becomes zero

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