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Magnetism and Electromagnetism

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

Maxwell
Tesla
Weber
All of the listed here

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Magnetism and Electromagnetism
Tesla is a unit of

Inductance
Field strength
Flux density
Flux

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Magnetism and Electromagnetism
The initial permeability of an iron rod is

The lowest permeability of the iron rod
The permeability at the end of the iron rod
The permeability almost in non-magnetised state
The highest permeability of the iron rod

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Magnetism and Electromagnetism
The ability of a material to remain magnetized after removal of the magnetizing force is known as

retentivity
hysteresis
reluctance
permeability

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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?

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

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Magnetism and Electromagnetism
When the north poles of two bar magnets are brought close together, there will be

a downward force
no force
a force of attraction
a force of repulsion

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