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Magnetism and Electromagnetism

Magnetism and Electromagnetism
The susceptibility of paramagnetic materials generally lies between

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

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Magnetism and Electromagnetism
When the current through the coil of an electromagnet reverses, the

magnetic field collapses
magnetic field expands
direction of the magnetic field reverses
direction of the magnetic field remains unchanged

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Magnetism and Electromagnetism
The induced voltage across a stationary conductor in a stationary magnetic field is

increased
decreased
zero
reversed in polarity

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Magnetism and Electromagnetism
A rectangular magnet of magnetic moment M is cut into two piece of same length, the magnetic moment of each piece will be

M/2
M/4
2M
M

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

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

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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

increases
remains the same
doubles
decreases

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