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Magnetism and Electromagnetism

Magnetism and Electromagnetism
The unit of relative permeability is

Its dimensionless
Hennry/meter
None of the listed here
Hennry

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Magnetism and Electromagnetism
The relative permeability of materials is not constant.

None of the listed here
Diamagnetic
Paramagnetic
Ferromagnetic

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Magnetism and Electromagnetism
What is the magnitude and the direction of force per 1.1m length of a pair of conductors of a direct current linecarrying 10 amperes and spaced 100 mm apart ?

22 x 10"5 N
22 x 10"8 N
22 x 10-6 N
22 x 10"7 N

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

Permanent magnet
None of the listed here
Weak magnet
Temporary Magnet

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Magnetism and Electromagnetism
Magnetising steel is normals difficult because

it has low permeability
it has high permeability
it corrodes easily
it has high specific gravity

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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?

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

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