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Magnetism and Electromagnetism

Magnetism and Electromagnetism
Ferrites are materials.

Paramagnetic
Diamagnetic
None of the listed here
Ferromagnetic

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Magnetism and Electromagnetism
A basic one-loop dc generator is rotated at 90 rev/s. How many times each second does the dc output voltage peak (reach maximum)?

270
90
360
180

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Magnetism and Electromagnetism
Air gap has_______eluctance as compared to iron or steel path

higher
zero
little
lower

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Magnetism and Electromagnetism
Magnetising steel is normals difficult because

it has low permeability
it has high permeability
it corrodes easily
it has high specific gravity

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Magnetism and Electromagnetism
Indicate which of the following material does not retain magnetism permanently.

Stainless steel
Hardened steel
None of the listed here
Soft iron

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Magnetism and Electromagnetism
The electromagnet has 50 turns and a current of 1A flows through the coil. If the length of the magnet circuit is 200 mm, what is the magnetic field strength?

0.25 AT/m
2500 AT/m
250 AT/m
25 AT/m

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