Exercise: Magnetism And Electromagnetism

Questions for: Magnetism And Electromagnetism

Which electromagnetic device contains an armature?
A:
A speaker
B:
A dc generator
C:
A relay
D:
A solenoid
Answer: B
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Which electromagnetic device has a movable iron core called a plunger?
A:
A speaker
B:
A dc generator
C:
A relay
D:
A solenoid
Answer: D
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What do you call the characteristic of a magnetic material whereby a change in magnetization lags the application of a magnetizing force?
A:
Hysteresis
B:
Induction
C:
Retentivity
D:
Reluctance
Answer: A
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The unit of flux density is known as
A:
magnetomotive force
B:
a weber
C:
a maxwell
D:
a tesla
Answer: D
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What is the reluctance of a material that has a length of 0.045 m, a cross-sectional area of 0.015 m2, and a permeability of 2500 µWb/At·m?
A:
833.33 µAt/Wb
B:
0.27 At/Wb
C:
1200 At/Wb
D:
More information is needed in order to find the reluctance.
Answer: C
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