Exercise: Materials And Components

Questions for: Materials And Components

An atom of polarizability a is placed in a homogeneous electric field E. The energy stored in polarized atom is
A:
aE2
B:
a2E
C:
aE2
D:
aE
Answer: C
No answer description is available. Let's discuss.
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The induced magnetic dipole moment has a direction opposite to the applied magnetic field.
A:
True
B:
False
C:
D:
Answer: A
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The v-i characteristic shown in the given figure is for
A:
thermistor
B:
photoconductor
C:
varistor
D:
none of the above
Answer: C
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The number of valence electrons in trivalent impurity is
A:
5
B:
4
C:
3
D:
1
Answer: C

Trivalent means 3 valence electrons.

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Sulphur hexafluoride is used in
A:
transformers
B:
generators
C:
relays
D:
circuit breakers
Answer: D

Sulphur hexafluoride is used in circuit breakers for arc quenching and insulation.

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