Exercise: Materials And Components

Questions for: Materials And Components

In paramagnetic materials
A:
permanent magnetic dipoles exist but the interaction between neighbouring dipoles is negligible
B:
permanent magnetic dipole do not exist
C:
permanent magnetic dipoles exist and the interaction between neighbouring dipoles is very strong
D:
permanent magnetic dipole moment may or may not exist
Answer: A

In paramagnetic materials interaction between neighbouring dipoles is negligible.

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Above ferroelectric curie temperature, spontaneous polarization in ferroelectric materials becomes stronger.
A:
True
B:
False
C:
D:
Answer: B

Spontaneous polarization vanishes above ferro-electric Curie temperature.

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Which capacitor-store higher amount of energy?
A:
Air capacitor
B:
Paper capacitor
C:
Mica capacitor
D:
Plastic film capacitor
Answer: C

Energy stored is proportional to capacitance and capacitance is proportional to permittivity.

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Diamond is a paramagnetic material.
A:
True
B:
False
C:
D:
Answer: B

Diamond is diamagnetic.

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