Magnetism and Electromagnetism
Strength of an electromagnet can be increased by

Increasing current supply
Increasing the cross-sectional area
All of the listed here
Increasing the number of turns

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Magnetism and Electromagnetism
A permanent magnet

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

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