Exercise: Magnetism And Electromagnetism

Questions for: Magnetism And Electromagnetism

What is the magnetomotive force in a 75-turn coil of wire when there are 4 A of current through it?
A:
18.75 At
B:
30 At
C:
300 At
D:
187 At
Answer: C
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The unit for permeability is
A:
Wb/At × m
B:
At/m
C:
At/Wb
D:
Wb
Answer: A
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What is the flux density in a magnetic field in which the flux in 0.1 m2 is 600 Wb?
A:
6,000 T
B:
600 T
C:
600 T
D:
6 T
Answer: A
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A basic one-loop dc generator is rotated at 90 rev/s. How many times each second does the dc output voltage peak (reach maximum)?
A:
90
B:
180
C:
270
D:
360
Answer: B
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There is 900 mA of current through a wire with 40 turns. What is the reluctance of the circuit if the flux is 400 Wb?
A:
14,400 At/Wb
B:
1,440 At/Wb
C:
9,000 At/Wb
D:
90,000 At/Wb
Answer: D
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