Physics, 11.11.2020 16:50 lluvihorsechief01

Why are electromagnets more useful than permanent magnets in many modern technologies?
A. A power supply is not necessary to use an electromagnet.
B. Electromagnets can be turned on and off by controlling the
current.
C. Permanent magnets with the same strength are heavier.
D. The strength of the magnetic field is more consistent in
permanent magnets.

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Why are electromagnets more useful than permanent magnets in many modern technologies?
A. A p...