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Electronics and Communication Engineering - Materials and Components

Exercise : Materials and Components - Section 4
11.
The equation D = ∈0∈r E refers only to isotropic materials.
True
False
Answer: Option
Explanation:
No answer description is available. Let's discuss.
12.
When a ferromagnetic substance is magnetised there are small changes in dimensions. This phenomenon is called
hysteresis
magnetostriction
diamagnetism
dipolar relaxation
Answer: Option
Explanation:
No answer description is available. Let's discuss.
13.

Assertion (A): In some materials, ∈r is independent of temperature while in others, ∈r depends on temperature.

Reason (R): If permanent dipoles are absent, ∈r varies with temperature.

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.
14.
An electron in a homogeneous magnetic field and having velocity perpendicular to the direction of field moves
perpendicular to the field
along the field
along a straight line inclined at 45° to field
in a circular path
Answer: Option
Explanation:
No answer description is available. Let's discuss.
15.
Spontaneous polarization occurs in ferroelectric materials.
True
False
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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