Exercise: Materials And Components

Questions for: Materials And Components

Which inductor is linear?
A:
Air cored
B:
Cast iron cored
C:
Sheet steel cored
D:
Iron alloy cored
Answer: A

For magnetic materials, permeability is not constant.

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A vacuum parallel plate capacitor is charged. The field between the plates is 2 x 104 V/m. If the space between the plates is filled with a material having ∈r = 10, then the value of field in the dielectric will be
A:
2 x 103 V/m
B:
x 104 V/m
C:
210 x 104 V/m
D:
2 x 105 V/m
Answer: A

D ∝ ∈rE. The flux density is the same.

Since ∈r has become 10 times, E decreases by 10 times.

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The materials which become polarized on the application of mechanical stress are called piezoelectric.
A:
True
B:
False
C:
D:
Answer: A
No answer description is available. Let's discuss.
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A wire is carrying current I. The field intensity H at a distance r from the wire
A:
is directed towards wire
B:
is directed away from wire
C:
is tangential every where to a circle of radius r
D:
none of the above
Answer: C
No answer description is available. Let's discuss.
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As the viscosity of a liquid increases, the relaxation time
A:
remains constant
B:
increases
C:
decreases
D:
first decreases then increases
Answer: B

Relaxation time increases with viscosity.

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