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Magnetism and Electromagnetism

Magnetism and Electromagnetism
What is the magneto-motive force in a 75-turn coil of wire when there are 4 A of current through it?

150 At
100 At
200 At
300 At

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Magnetism and Electromagnetism
An electromagnetic field exists only when there is

decreasing current
voltage
current
an increasing current

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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
Core of an electromagnet should have

None of the listed here
Low coercivity
Both low coercivity and high susceptibility
High susceptibility

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Magnetism and Electromagnetism
The retentivity of material is useful for the construction of

Non-magnetic substances
Electromagnets
Permanent magnets
Transformers

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Magnetism and Electromagnetism
Magnetic moment is a

pole strength
scalar quantity
universal constant
vector quantity

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