Which one of the following material is most suitable for making core of an electromagnet ?
Correct answer: D. soft iron
- A. air
- B. steel
- C. Cu-Ni alloy
- D. soft iron
Explanation
Soft iron is suitable for an electromagnet because it has high magnetic permeability and loses most of its magnetism when the current is switched off. Students may choose steel because it can produce a strong magnet, but steel retains magnetism and is better for permanent magnets.
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About Magnetic Flux Density
Magnetic flux density measures the magnetic force acting on a current carrying conductor or moving charge in a magnetic field. Work includes the relations B equals F divided by IL and F equals qvB, the tesla as its SI unit, field direction and the distinction between flux density and magnetic flux.
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