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Magnetism and Electromagnetism

Magnetism and Electromagnetism
Tesla is a unit of

Field strength
Flux
Flux density
Inductance

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

Permanent magnets
Non-magnetic substances
Electromagnets
Transformers

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Magnetism and Electromagnetism
The unit for reluctance is

tesla
At/m
Wb
At/Wb

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Magnetism and Electromagnetism
Paramagnetic materials have relative permeability

equal to unity
slightly more than unity
equal to that ferromagnetic mate rials
slightly less than unity

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Magnetism and Electromagnetism
For a given wire-wound core, an increase in current through the coil

Causes no change in flux density
Decreases the flux density
Increases the flux density
Reverses the flux lines

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Magnetism and Electromagnetism
A 300 mm long conductor is carrying a current of 10 A and is situated at right angles to a magnetic field having a flux density of 0.8 T ; the force on the conductor will be

2.4 N
0.24 N
24 N
240 N

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MORE MCQ ON Magnetism and Electromagnetism

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