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Magnetism and Electromagnetism

Magnetism and Electromagnetism
Indicate which of the following material does not retain magnetism permanently.

Soft iron
Stainless steel
None of the listed here
Hardened steel

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Magnetism and Electromagnetism
The attraction capacity of electromagnet will increase if the

Core length increases
Flux density decreases
Flux density increases
Core area increases

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Magnetism and Electromagnetism
The materials having low retentivity are suitable for making

None of the listed here
Weak magnet
Temporary Magnet
Permanent magnet

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Magnetism and Electromagnetism
Which of the following is a ferromagnetic material?

Copper
Tungsten
Aluminium
Nickel

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Magnetism and Electromagnetism
For a given wirewound core, an increase in current through the coil

reverses the flux lines
increases the flux density
causes no change in flux density
decreases the flux density

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

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