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Magnetism and Electromagnetism

Magnetism and Electromagnetism
Substances which have permeability less than the permeability of free space are known as

Ferro magnetic material
Bipolar
Paramagnetic material
Diamagnetic material

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

remains unchanged
reverses polarity
increases
decreases

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Magnetism and Electromagnetism
The magnetic materials exhibit the property of magnetisation because of

spin of nucleus
orbital motion of electrons
spin of electrons
either of these

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Magnetism and Electromagnetism
What is the magnitude and the direction of force per 1.1m length of a pair of conductors of a direct current linecarrying 10 amperes and spaced 100 mm apart ?

22 x 10-6 N
22 x 10"8 N
22 x 10"5 N
22 x 10"7 N

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Magnetism and Electromagnetism
An electromagnetic field exists only when there is

an increasing current
current
decreasing current
voltage

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Magnetism and Electromagnetism
Core of an electromagnet should have

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

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MORE MCQ ON Magnetism and Electromagnetism

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