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Magnetism and Electromagnetism
Magnetism and Electromagnetism
When the current through the coil of an electromagnet reverses, the
direction of the magnetic field reverses
magnetic field collapses
direction of the magnetic field remains unchanged
magnetic field expands
direction of the magnetic field reverses
magnetic field collapses
direction of the magnetic field remains unchanged
magnetic field expands
Answer
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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
doubles
increases
remains the same
decreases
doubles
increases
remains the same
decreases
Answer
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Magnetism and Electromagnetism
For a given wirewound core, an increase in current through the coil
causes no change in flux density
increases the flux density
reverses the flux lines
decreases the flux density
causes no change in flux density
increases the flux density
reverses the flux lines
decreases the flux density
Answer
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Magnetism and Electromagnetism
The induced voltage across a coil with 250 turns that is located in a magnetic field that is changing at a rate of 8 Wb/s is
2,000 V
3,125 V
31.25 V
1,000 V
2,000 V
3,125 V
31.25 V
1,000 V
Answer
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Magnetism and Electromagnetism
When the speed at which a conductor is moved through a magnetic field is increased, the induced voltage
decreases
remains constant
reaches zero
increases
decreases
remains constant
reaches zero
increases
Answer
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