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Magnetism and Electromagnetism

Magnetism and Electromagnetism
The unit for reluctance is

At/m
At/Wb
Wb
tesla

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Magnetism and Electromagnetism
A permeable substance is one

which is a good conductor
which is a bad conductor
which is a strong magnet
through which the magnetic lines of force can pass very easily

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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

remains the same
decreases
doubles
increases

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Magnetism and Electromagnetism
The retentivity of material is useful for the construction of

Transformers
Permanent magnets
Electromagnets
Non-magnetic substances

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Magnetism and Electromagnetism
What is the magnetomotive force (mmf) of a wire with 8 turns carrying three amperes of current?

2.4 At
24 At
2,400 At
240 At

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Magnetism and Electromagnetism
Ferrites are a sub-group of

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

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MORE MCQ ON Magnetism and Electromagnetism

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