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Magnetism and Electromagnetism

Magnetism and Electromagnetism
The unit for reluctance is

Wb
tesla
At/Wb
At/m

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Magnetism and Electromagnetism
A keeper is used to

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

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Magnetism and Electromagnetism
If a loop in a basic dc generator suddenly begins rotating at a faster speed, the induced voltage

increases
remains unchanged
decreases
reverses polarity

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Magnetism and Electromagnetism
Ferrites are materials.

Diamagnetic
None of the listed here
Ferromagnetic
Paramagnetic

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Magnetism and Electromagnetism
The initial permeability of an iron rod is

The highest permeability of the iron rod
The permeability at the end of the iron rod
The permeability almost in non-magnetised state
The lowest permeability of the iron rod

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Magnetism and Electromagnetism
Tesla is a unit of

Inductance
Flux
Flux density
Field strength

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MORE MCQ ON Magnetism and Electromagnetism

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