Exercise: Magnetism And Electromagnetism

Questions for: Magnetism And Electromagnetism

Lenz's law defines the polarity of the induced voltage.
A:
True
B:
False
C:
D:
Answer: A
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If a loop in a basic dc generator suddenly begins rotating at a faster speed, the induced voltage
A:
remains unchanged
B:
reverses polarity
C:
increases
D:
decreases
Answer: C
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What is the magnetomotive force (mmf) of a wire with 8 turns carrying three amperes of current?
A:
2,400 At
B:
240 At
C:
24 At
D:
2.4 At
Answer: C
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When a solenoid is activated, the force that moves the plunger is
A:
an electromagnetic field
B:
a permanent magnetic field
C:
varying voltage
D:
a steady current
Answer: A
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An electromagnetic field exists only when there is
A:
an increasing current
B:
decreasing current
C:
voltage
D:
current
Answer: D
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