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

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

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Magnetism and Electromagnetism
The magnetic reluctance of a material

Does not vary with increasing cross-sectional area of material
Increases with increasing cross-sec-tional area of material
Any of the listed here
Decreases with increasing cross sectional area of material

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Magnetism and Electromagnetism
A permanent magnet

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

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