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Magnetism and Electromagnetism

Magnetism and Electromagnetism
The electromagnet has 50 turns and a current of 1A flows through the coil. If the length of the magnet circuit is 200 mm, what is the magnetic field strength?

2500 AT/m
0.25 AT/m
25 AT/m
250 AT/m

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Magnetism and Electromagnetism
The initial permeability of an iron rod is

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

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

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

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Magnetism and Electromagnetism
Strength of an electromagnet can be increased by

Increasing the number of turns
Increasing current supply
All of the listed here
Increasing the cross-sectional area

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Magnetism and Electromagnetism
The ability of a material to remain magnetized after removal of the magnetizing force is known as

reluctance
hysteresis
retentivity
permeability

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Magnetism and Electromagnetism
Temporary magnets are used in

Loud speakers
Motors
All of the listed here
Generators

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MORE MCQ ON Magnetism and Electromagnetism

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