MAGNETISM AND ELECTROMAGNETISM QUIZ

For which of the following materials the net magnetic moment should be zero?

diamagnetic materials

antiferromagnetic materials

ferrimagnetic materials

antiferrimagnetic materials

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Core of an electromagnet should have

Both low coercivity and high susceptibility

High susceptibility

None of the listed here

Low coercivity

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The unit of relative permeability is

Hennry/meter

Its dimensionless

Hennry

None of the listed here

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A basic one-loop dc generator is rotated at 90 rev/s. How many times each second does the dc output voltage peak (reach maximum)?

180

270

360

90

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The attraction capacity of electromagnet will increase if the

Core area increases

Core length increases

Flux density decreases

Flux density increases

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The Biotsavart's law is a general modification of

Lenz's law

Faraday's laws

Ampere's law

Kirchhoff's law

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If a loop in a basic dc generator suddenly begins rotating at a faster speed, the induced voltage

decreases

increases

reverses polarity

remains unchanged

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When a magnet is in motion relative to a coil the induced e.m.f. does not depend upon

Motion of the magnet

Resistance of the coil

Pole strength of the magnet

Number of turns of the coil

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The ratio of intensity of magnetisation to the magnetisation force is known as

None of the listed here

Susceptibility

Relatice permeability

Flux density

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Unit for quantity of electricity is

Ampere

Joule

Ampere-hour

Coulomb

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