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Magnetism and Electromagnetism

Magnetism and Electromagnetism
Air gap has_______eluctance as compared to iron or steel path

higher
little
zero
lower

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Magnetism and Electromagnetism
The force between two long parallel conductors is inversely proportional to

Distance between the conductors
Radius of conductor
Current in one conductor
Product of current in two conductors

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Magnetism and Electromagnetism
Which of the following is expected to have the maximum permeability ?

Ebolite
Brass
Zinc
Copper

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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?

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

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Magnetism and Electromagnetism
What is the flux density in a magnetic field in which the flux in 0.1 m2 is 600 Wb?

6,000 T
600 T
600 T
6 T

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

Nickel
Tungsten
Copper
Aluminium

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