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Electronics and Communication Engineering - Materials and Components

Exercise : Materials and Components - Section 6
26.
Soft iron is suitable for making temporary magnets.
True
False
Answer: Option
Explanation:
No answer description is available. Let's discuss.
27.
Antiferromagnetic materials do not have permanent dipoles.
True
False
Answer: Option
Explanation:

Anti-ferromagnetic materials have permanent dispoles but antiparallel orientation of equal moments.

28.
The Ohm's law for conduction in metals is
J = σE
J =
J ∝ σE
J ∝
Answer: Option
Explanation:
No answer description is available. Let's discuss.
29.
The measurement of Hall coefficient of a semiconductor with one type of charge carriers gives the information about
sign of charge carrier
density of charge carrier
both sign and density of charge carrier
none of the above
Answer: Option
Explanation:
No answer description is available. Let's discuss.
30.
∈0 has no other physical meaning than that of a fundamental conversion factor.
True
False
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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