Exercise: Magnetism And Electromagnetism

Questions for: Magnetism And Electromagnetism

When the current through the coil of an electromagnet reverses, the
A:
direction of the magnetic field reverses
B:
direction of the magnetic field remains unchanged
C:
magnetic field expands
D:
magnetic field collapses
Answer: A
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If the cross-sectional area of a magnetic field increases, but the flux remains the same, the flux density
A:
increases
B:
decreases
C:
remains the same
D:
doubles
Answer: B
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For a given wirewound core, an increase in current through the coil
A:
reverses the flux lines
B:
decreases the flux density
C:
increases the flux density
D:
causes no change in flux density
Answer: C
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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
A:
1,000 V
B:
2,000 V
C:
31.25 V
D:
3,125 V
Answer: B
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When the speed at which a conductor is moved through a magnetic field is increased, the induced voltage
A:
increases
B:
decreases
C:
remains constant
D:
reaches zero
Answer: A
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