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Magnetism and Electromagnetism

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

Ferromagnetic
Paramagnetic
Diamagnetic
None of the listed here

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Magnetism and Electromagnetism
Ferrites are a sub-group of

Non-magnetic materials
Ferri-magnetic material
Paramagnetic material
Ferro magnetic material

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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
Which of the following is not a unit of flux?

Maxwell
Weber
All of the listed here
Tesla

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

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

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Magnetism and Electromagnetism
Which of the following is expected to have the maximum permeability ?

Zinc
Brass
Ebolite
Copper

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