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Electronics and Communication Engineering - Materials and Components

Exercise : Materials and Components - Section 2
41.

Assertion (A): The optical dielectric constant (i.e., εr at optical frequencies)of ionic dielectrics is less than static dielectric constant.

Reason (R): At optical frequencies, Pi = 0.

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.
42.
A piece of iron is placed in a magnetic field
the magnetic field will not be affected
the magnetic lines of force will bend to pass through the piece
the magnetic lines of force will bend away from the piece
any of the above depending on type of iron
Answer: Option
Explanation:
No answer description is available. Let's discuss.
43.

Assertion (A): Magnetism can be explained by the theory of magnetic domains.

Reason (R): The existence of magnetic domains is evident from the Bitter powder patterns.

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.
44.
Ferromagnetic materials
shows spontaneous magnetisation below a certain temperature
have resistivity very high as compared to that of iron
can be used even at microwave frequencies
all of the above
Answer: Option
Explanation:
No answer description is available. Let's discuss.
45.
In a specimen of ferromagnetic material, as the flux density is increased from zero to 2.5 T, µr will
increase
decrease
first decrease then increase
first increase then decrease
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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