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Magnetism and Electromagnetism

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?

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

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Magnetism and Electromagnetism
The magnetic materials exhibit the property of magnetisation because of

spin of electrons
either of these
orbital motion of electrons
spin of nucleus

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Magnetism and Electromagnetism
Unit for quantity of electricity is

Ampere-hour
Ampere
Coulomb
Joule

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Magnetism and Electromagnetism
A keeper is used to

Restore lost flux
Provide a closed path for flux
Amplify flux
Change the direction of magnetic lines

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

decreases
remains the same
increases
doubles

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

Weber
Tesla
All of the listed here
Maxwell

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