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WorksheetsDielectric Capacitors
Total questions: 10
Worksheet time: 5mins
Name
Class
Date
1.
An air-filled parallel-plate capacitor has a capacitance of 1 pF. The plate separation is then doubled and a wax dielectric is inserted, completely filling the space between the plates. As a result, the capacitance becomes 2 pF. The dielectric constant of the wax is:
a)
0.25
b)
0.50
c)
2.0
d)
4.0
2.
A dielectric slab is slowly inserted between the plates of a parallel plate capacitor while the capacitor is connected to a battery. As it is being inserted:
a)
the capacitance and the charge on the plate increase but the potential difference between the plates remains the same
b)
the capacitance and the charge on the positive plate decrease but the potential difference between the plates remains the same
c)
the potential difference between the plates increases, the charge on the positive plate decreases, and the capacitance remains the same
d)
the capacitance, the potential difference between the plates, the charge on the positive plate all decrease
3.
What happens to the atoms in a dielectric when it is placed between the plates of a charged capacitor?
a)
They begin to conduct electricity.
b)
They create an induced electric field that is in the opposite direction of the field due to the charges on the plates.
c)
They create an induced electric field that is in the same direction as the field due to the charges on the plates.
d)
They completely cancel the electric field due to the charges on the plates.
4.
An air-filled capacitor is charged, and then a dielectric is inserted. As a result, there is an induced charge on the dielectric. What is the difference between induced charge and free charge?
a)
There is no difference.
b)
Induced charge does not result in a net charge on the dielectric.
c)
Induced charge is smaller than free charge.
d)
Free charge creates an electric field, but induced charge does not.
5.
Which of the following is not a dielectric?
a)
silicon
b)
germanium
c)
polystyrene
d)
titanium
6.
A parallel-plate capacitor has a plate area of 0.30 m2 and a plate separation of 0.10 mm. If the charge on each plate has a magnitude of 5.0 ´ 10–6 C, what is the energy density in its electric field?
a)
0.16 J/m3
b)
3.5 J/m3
c)
7.8 J/m3
d)
16 J/m3
7.
What is the symbol for dielectric permeativity.
a)
ε
b)
εr
c)
ε0
d)
εrε0
8.
What is the formula for capacitance in air?
a)
C=
εA/d
εA/d
b)
C=Q/V
c)
C=
ε0d/A
ε0d/A
d)
C=
εoA/d
εoA/d
9.
What happens to capacitance if you increase the distance of separation of the metal plates?
a)
Increases
b)
Decreases
c)
Remains the same
10.
Which is the Q vs t graph for the charging process of a capacitor?
a)
a
b)
b
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