Exercise: Magnetism And Electromagnetism

Questions for: Magnetism And Electromagnetism

If the steel disk in a crankshaft position sensor has stopped with the tab in the magnet's air gap, the induced voltage
A:
increases
B:
decreases
C:
is zero
D:
will remain constant
Answer: C
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The unit for reluctance is
A:
tesla
B:
At/Wb
C:
At/m
D:
Wb
Answer: B
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What is the flux density when the flux is 5.5 Wb and the cross-sectional area is 6 × 10–3 m2?
A:
91.7 T
B:
917 T
C:
91 T
D:
9.7 T
Answer: B
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A coil of wire is placed in a changing magnetic field. If the number of turns in the coil is decreased, the voltage induced across the coil will
A:
increase
B:
decrease
C:
remain constant
D:
be excessive
Answer: B
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What is the reluctance of a material that has a length of 0.07 m, a cross-sectional area of 0.014 m2, and a permeability of 4,500 Wb/At × m?
A:
1111 At/Wb
B:
111 At/Wb
C:
11 At/Wb
D:
1 At/Wb
Answer: A
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