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Magnetism and Electromagnetism

Magnetism and Electromagnetism
If the cross-sectional area of a magnetic field increases, but the flux remains the same, the flux density

remains the same
increases
decreases
doubles

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Magnetism and Electromagnetism
What is the magnetomotive force in a 75-turn coil of wire when there are 4 A of current through it?

300 At
18.75 At
187 At
30 At

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Magnetism and Electromagnetism
The relative permeability of materials is not constant.

None of the listed here
Ferromagnetic
Diamagnetic
Paramagnetic

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Magnetism and Electromagnetism
The attraction capacity of electromagnet will increase if the

Flux density decreases
Core length increases
Flux density increases
Core area increases

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

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Magnetism and Electromagnetism
Which of the following is not a unit of flux?

All of the listed here
Maxwell
Tesla
Weber

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