Exercise: Materials And Components

Questions for: Materials And Components

A parallel plate capacitor has area of plate A and plate separation d. Its capacitance is C. A metallic plate P of area A and negligible thickness is added as shown in Figure. The new value of capacitance is
A:
C
B:
2C
C:
0.5 C
D:
0.25 C
Answer: A

The new configuration has two capacitors in series and the capacitance of each is 2C.

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In anti-ferromagnetic materials, the graph of susceptibility versus temperature shows a sharp maximum at a certain temperature. This temperature is known as
A:
Curie temperature
B:
Neel temperature
C:
Weiss temperature
D:
Bitter temperature
Answer: B
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As the temperature of semiconductor is increased
A:
the average number of free charge carriers decreases
B:
the average number of free charge carriers increases
C:
the average number of free charge carriers remains the same
D:
the average number of free charge carriers may increase or decrease
Answer: B

As temperature increases, conductivity of semi- conductors increases.

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A copper atom is neutral. Its core has a net charge of
A:
0
B:
+ 1
C:
- 1
D:
+ 2
Answer: B
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The real part of complex dielectric constant and tanΞ΄ for a dielectric are 2.1 and 5 x 10-4 at 100 Hz respectively. The imaginary part of dielectric constant at 100 Hz is
A:
1.05 x 10-3
B:
2.1 x 10-3
C:
5 x 10-3
D:
1.05 x 10-2
Answer: A

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