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Magnetism and Electromagnetism

Magnetism and Electromagnetism
There is 900 mA of current through a wire with 40 turns. What is the reluctance of the circuit if the flux is 400 Wb?

9,000 At/Wb
90,000 At/Wb
14,400 At/Wb
1,440 At/Wb

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Magnetism and Electromagnetism
Ferrites are materials.

Ferromagnetic
None of the listed here
Paramagnetic
Diamagnetic

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

Stainless steel
Hardened steel
Soft iron
None of the listed here

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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
The magnetic materials exhibit the property of magnetisation because of

spin of nucleus
either of these
spin of electrons
orbital motion of electrons

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Magnetism and Electromagnetism
A permeable substance is one

through which the magnetic lines of force can pass very easily
which is a bad conductor
which is a strong magnet
which is a good conductor

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