Multiple choice

Which of the following materials is best suited as the core of an electromagnet?

  1. Steel

  2. Alnico

  3. Magnetite

  4. Iron
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Iron (specifically soft iron) is the best core material for electromagnets. It has very high magnetic permeability, meaning it strongly concentrates magnetic field lines. Iron magnetizes and demagnetizes rapidly when current is turned on/off. Steel retains residual magnetism (becomes permanent), alnico is designed for permanent magnets, and magnetite is a naturally magnetic mineral.

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