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Magnetism and Electromagnetism

Magnetism and Electromagnetism
What is the flux density when the flux is 5.5 Wb and the cross-sectional area is 6 × 10–3 m2?

91 T
91.7 T
917 T
9.7 T

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Magnetism and Electromagnetism
Paramagnetic materials have relative permeability

slightly more than unity
equal to that ferromagnetic mate rials
equal to unity
slightly less than unity

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Magnetism and Electromagnetism
The direction of magnetic lines of force is

From one end of the magnet to another
None of the listed here
From north pole to south pole
From south pole to north pole

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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)?

180
90
270
360

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Magnetism and Electromagnetism
For a given wirewound core, an increase in current through the coil

causes no change in flux density
reverses the flux lines
decreases the flux density
increases the flux density

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Magnetism and Electromagnetism
A keeper is used to

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

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MORE MCQ ON Magnetism and Electromagnetism

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