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

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

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Magnetism and Electromagnetism
A permanent magnet

Attracts ferromagnetic substances and repels all others
Attracts some substances and repels others
Attracts all paramagnetic substances and repels others
Attracts only ferromagnetic substances

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