MAGNETISM AND ELECTROMAGNETISM QUIZ

Which of the following is a vector quantity?

Magnetic potential

Relalative permeability

Magnetic field intensity

Flux density

TRUE ANSWER : ?
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The magnetic reluctance of a material

Any of the listed here

Does not vary with increasing cross-sectional area of material

Increases with increasing cross-sec-tional area of material

Decreases with increasing cross sectional area of material

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Degaussing is the process of

Demagnetising metallic parts

Remagnetising metallic parts

Removal of magnetic impurities

Removing gases from the materials

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Strength of an electromagnet can be increased by

Increasing current supply

Increasing the cross-sectional area

All of the listed here

Increasing the number of turns

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What is the flux density in a magnetic field in which the flux in 0.1 m2 is 600 Wb?

6,000 T

600 T

6 T

600 T

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

Resistance of the coil

Number of turns of the coil

Pole strength of the magnet

Motion of the magnet

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The magnetic materials exhibit the property of magnetisation because of

orbital motion of electrons

either of these

spin of electrons

spin of nucleus

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If the steel disk in a crankshaft position sensor has stopped with the tab in the magnet's air gap, the induced voltage

Decrease

Increase

None of the listed here

Is zero

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The materials having low retentivity are suitable for making

Permanent magnet

Weak magnet

None of the listed here

Temporary Magnet

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The relative permeability is less than unity is case of

Ferromagnetic material

Diamagnetic material

Ferrits

Paramagnetic material

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