Exercise: Materials And Components

Questions for: Materials And Components

Assertion (A): In ionic dielectrics, P = Pe + Pi.

Reason (R): In ionic crystals, permanent electric dipole moment is zero.

A:
Both A and R are true and R is correct explanation of A
B:
Both A and R are true but R is not correct explanation of A
C:
A is true but R is false
D:
A is false but R is true
Answer: A

In ionic dielectrics μp = ∑i ei ri and Po = 0.

Therefore P = Pe + Pi.

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A leaky dielectric has ∈r = ∈r' - j∈r". If a field E is applied, the current component in phase with E is proportional to ∈r".
A:
True
B:
False
C:
D:
Answer: A
No answer description is available. Let's discuss.
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Which of the following is used in automatic control of street lights?
A:
Thermistor
B:
Photoconductor
C:
Transistor
D:
Varistor
Answer: B
No answer description is available. Let's discuss.
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The temperature coefficient of resistivity of semiconductors is
A:
positive
B:
negative
C:
may be positive or negative
D:
very low
Answer: B

Resistance of semiconductors decreases with increase in temperature.

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The units for electric dipole moment are
A:
coulombs
B:
colomb-metre
C:
coulomb/metre
D:
coulomb/m2
Answer: B

It is product of charge and distance.

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