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Magnetism and Electromagnetism

Magnetism and Electromagnetism
The susceptibility of paramagnetic materials generally lies between

1CT3 and 1CT7
KT3 and 1CT6
KT4 and KT8
10"2 and KT5

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Magnetism and Electromagnetism
A material which is slightly repelled by a magnetic field is known as

ferromagnetic material
paramagnetic material
conducting material
diamagnetic material

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Magnetism and Electromagnetism
A square cross-sectional magnet has a pole strength of 1 x 10 Wb and cross sectional area of 20 mm x 20 mm. What is the strength at a distance of 100 mm from the unit pole in air ?

63380 N/Wb
6338 N/Wb
633.8 N/Wb
63.38 N/Wb

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Magnetism and Electromagnetism
If the cross-sectional area of a magnetic field increases, but the flux remains the same, the flux density

remains the same
doubles
decreases
increases

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Magnetism and Electromagnetism
A keeper is used to

Restore lost flux
Change the direction of magnetic lines
Provide a closed path for flux
Amplify flux

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Magnetism and Electromagnetism
How does the magnetic compass needle behave in a magnetic field?

It starts rotating
None of the listed here
It assures a position right angle to magnetic field
It assures a position which follows a line of magnetic flux

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