Exercise: Magnetism And Electromagnetism

Questions for: Magnetism And Electromagnetism

The Hall effect
A:
is a phenomenon with no practical applications
B:
is used in various sensor applications
C:
can develop potentials of thousands of volts
D:
is the basis for solar cell operation
Answer: B
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What are the effects of moving a closed wire loop through a magnetic field?
A:
A voltage is induced in the wire.
B:
A current is induced in the wire.
C:
The polarity across the wire depends on the direction of motion.
D:
All of the above
Answer: D
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How much flux is there in a magnetic field when its flux density is 5000 mu.gifT and its cross-sectional area is 300 mm2?
A:
16.67 mWb
B:
5.0 mu.gifWb
C:
3.0 mWb
D:
1.5 mu.gifWb
Answer: D
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What is the flux density of a magnetic field whose flux is 3000 µWb and cross-sectional area is 0.25 m2?
A:
12,000 mu.gifT
B:
83,330 T
C:
0 T
D:
More information is needed in order to find flux density.
Answer: A
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Which electromagnetic device uses brushes and a commutator?
A:
A speaker
B:
A dc generator
C:
A relay
D:
A solenoid
Answer: B
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