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Electronics and Communication Engineering - Materials and Components

Exercise : Materials and Components - Section 5
16.
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".
True
False
Answer: Option
Explanation:
No answer description is available. Let's discuss.
17.

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

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

Both A and R are true and R is correct explanation of A
Both A and R are true but R is not correct explanation of A
A is true but R is false
A is false but R is true
Answer: Option
Explanation:

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

Therefore P = Pe + Pi.

18.
The current flow in a semiconductor is due to
holes
electrons
holes and electrons
holes, electrons and ions
Answer: Option
Explanation:
No answer description is available. Let's discuss.
19.

Assertion (A): Relative permittivity is determined by the atomic structure of the material.

Reason (R): Absolute permittivity is determined by the atomic structure of the material.

Both A and R are true and R is correct explanation of A
Both A and R are true but R is not correct explanation of A
A is true but R is false
A is false but R is true
Answer: Option
Explanation:
No answer description is available. Let's discuss.
20.
Eddy current loss is
proportional to frequency
independent of frequency
proportional to (frequency)2
proportional to (frequency)3
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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