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Magnetism and Electromagnetism

Magnetism and Electromagnetism
Temporary magnets are used in

Loud speakers
Generators
All of the listed here
Motors

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Magnetism and Electromagnetism
The stray line of magnetic flux is defined as

A line of magnetic flux in a non-uniform field
The mean length of a ring shaped coil
A line vertical to the flux lines
A line of magnetic flux which does not follow the designed path

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Magnetism and Electromagnetism
What is the reluctance of a material that has a length of 0.07 m, a cross-sectional area of 0.014 m2, and a permeability of 4,500 Wb/At × m?

1111 At/Wb
111 At/Wb
1 At/Wb
11 At/Wb

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Magnetism and Electromagnetism
Strength of an electromagnet can be increased by

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

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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?

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

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Magnetism and Electromagnetism
Magnetism of a magnet can be destroyed by

By inductive action of another magnet
Hammering
All of the listed here
Heating

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MORE MCQ ON Magnetism and Electromagnetism

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