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Electronics and Communication Engineering - Materials and Components

Exercise : Materials and Components - Section 7
46.
For magnetic shielding, we need a ferromagnetic material.
True
False
Answer: Option
Explanation:
No answer description is available. Let's discuss.
47.

Assertion (A): Electronic polarizability increases as atoms becomes larger.

Reason (R): For rare gas, ∈0(∈r - 1) E = Nae, where N is number of atoms/m3 and ae is electronic polarizability of 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.
48.
In a metal, the valence electrons
are not shared
are shared only between neighbouring atoms
are shared by all atoms
either (b) or (c)
Answer: Option
Explanation:

In a metal the valence electrons belong to all atoms.

49.
All magnetic materials exhibit the phenomenon of saturation.
True
False
Answer: Option
Explanation:
No answer description is available. Let's discuss.
50.
In p type semiconductor, the conductivity due to holes is (e = charge on hole, μp = hole mobility, p = hole concentration)
peμp
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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