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

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

None of the listed here
Stainless steel
Hardened steel
Soft iron

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

Ferromagnetic
None of the listed here
Diamagnetic
Paramagnetic

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Magnetism and Electromagnetism
Which of the following is not a unit of flux?

Maxwell
Weber
All of the listed here
Tesla

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Magnetism and Electromagnetism
When two ends of a circular uniform wire are joined to the terminals of a battery, the field at the center of the circle

will be zero
will depend on the amount of e.m.f. applied
will depend on the radius of the circle
will be infinite

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Magnetism and Electromagnetism
The use of permanent magnets is. not made in

Transformers
Loud speakers
Energy meters
None of the listed here

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