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Electronics and Communication Engineering - Materials and Components

Exercise : Materials and Components - Section 5
21.
The dipole moment per unit volume P as a function of E for an insulator is
P = ∈0 E(∈r)
P = ∈0 E
P = ∈0(∈r - 1) E
P =
Answer: Option
Explanation:
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22.
A good dielectric should have
low losses
good heat conductivity
high intrinsic strength
all of the above
Answer: Option
Explanation:
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23.
Magnetic hysteresis phenomenon is explained by
motion of domain walls
motion of domain walls and domain rotation
domain rotation
none of the above
Answer: Option
Explanation:
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24.
If a metal specimen has n valence electrons per m3 each having charge e and mass m and t is the relaxations time, the conductivity is
Answer: Option
Explanation:
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25.
The relation between thermal conductivity K (W/m/°C), heat flow density Q (watt/m2) and dT/dx (°C per metre) is
Q = K(dT/dx)
Q = - K(dT/dx)
K = Q(dT/dx)
dT/dx = - QK
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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