Exercise: Materials And Components

Questions for: Materials And Components

The units of μ0 and μr are
A:
H/m for both
B:
H/m for μr and no units for μ0
C:
H/m for μ0 and no units for μr
D:
Wb/m for μ0 and no units for μr
Answer: C

μr is only a numeric.

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There is no hysteresis phenomenon is any dielectric material.
A:
True
B:
False
C:
D:
Answer: B

Hysteresis phenomenon exists in dielectic materials.

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If the temperature of an extrinsic semiconductor is increased so that the intrinsic carrier concentration is doubled, then
A:
the majority carrier density is doubled
B:
the minority carrier density is doubled
C:
the minority carrier density becomes 4 times the original value
D:
both the majority and minority carrier densities double
Answer: D

As the intrinsic carrier concentration is doubled, the concentration of both electrons and holes is doubled.

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The attraction between the nucleus and valence electron of copper atom is
A:
zero
B:
weak
C:
strong
D:
either zero or strong
Answer: B

The valence electron, in copper atom, can be easily detached from nucleus.

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Assertion (A): Magnetic susceptibility of diamagnetic materials is much less than that of paramagnetic materials.

Reason (R): For diamagnetic as well as paramagnetic materials, μr is nearly equal to 1.

A:
Both A and R are true and R is correct explanation of A
B:
Both A and R are true but R is not correct explanation of A
C:
A is true but R is false
D:
A is false but R is true
Answer: A

Magnetic susceptibility = (μr - 1)H.

For diamagnetic and paramagnetic materials magnetic susceptibility is very very small and μr = 1.

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