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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
Which of the following is not a unit of flux?

All of the listed here
Weber
Maxwell
Tesla

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Magnetism and Electromagnetism
What is the reluctance of a material that has a length of 0.07 m, a cross-sectional area of 0.014 m2, and a permeability of 4,500 Wb/At × m?

1111 At/Wb
11 At/Wb
1 At/Wb
111 At/Wb

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Magnetism and Electromagnetism
The unit for reluctance is

At/Wb
Wb
tesla
At/m

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Magnetism and Electromagnetism
A keeper is used to

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

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Magnetism and Electromagnetism
For a given wire-wound core, an increase in current through the coil

Reverses the flux lines
Causes no change in flux density
Decreases the flux density
Increases the flux density

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