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Magnetism and Electromagnetism

Magnetism and Electromagnetism
Temporary magnets are used in

Generators
Motors
Loud speakers
All of the listed here

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Magnetism and Electromagnetism
How does the magnetic compass needle behave in a magnetic field?

None of the listed here
It assures a position right angle to magnetic field
It starts rotating
It assures a position which follows a line of magnetic flux

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

Permanent magnets
Electromagnets
Non-magnetic substances
Transformers

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Magnetism and Electromagnetism
A keeper is used to

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

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Magnetism and Electromagnetism
What is the magneto-motive force in a 75-turn coil of wire when there are 4 A of current through it?

300 At
100 At
150 At
200 At

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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)?

90
360
270
180

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MORE MCQ ON Magnetism and Electromagnetism

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