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Capacitors and Dielectric

Total questions: 33

Worksheet time: 21mins

Name
Class
Date
1.
The figure to the right represents:
a)
Capacitor
b)
Diode
c)
Inductor
d)
Resistor
2.
With respect to the capacitor, which relationship is true?
a)
C = Q/V
b)
V = C×Q
c)
Q = C/V
d)
Q = V/C
3.
What is the voltage across   the plates of the capacitor if  the capacitance is 10 uF and the Charge stored is  30 uC?
a)
0.333 V
b)
3 V
c)
300 V
4.

When capacitors is arrange in series (3 capacitors), the equivalent capacitance C is

a)

C = C1 + C2 + C3

b)

1/C = 1/C1 + 1/C2 + 1/C3

c)

C = QV1 + QV2 + QV3

d)

C = CR1 + CR2 + CR3

5.

When capacitors in parallel (3 capacitors), the equivalent capacitance is

a)

C = C1 + C2 + C3

b)

C = 1/C1 + 1/C2 + 1/C3

c)

C = QV1 + QV2 + QV3

d)

C = QV1 + QV2 + QV3

6.

If 4μF and 2μF capacitors are conneced in series, the equivalent capacitor is ___________.

a)

1.33μF

b)

0.75μF

c)

6μF

d)

2μF

7.

If capacitors are connected in parallel, then potential difference across each capacitor is

a)

same

b)

zero

c)

different

d)

infinite

8.

When a 4 V battery is connected to a capacitor, what is the voltage across the capacitor after a long period of time?

a)

0.0 V

b)

2.0 V

c)

4.0 V

d)

3.0 V

9.
The dielectric constant is the:
a)
resistivity
b)
relative permittivity
c)
conductivity
d)
permeability
10.
----------------- is permittivity of a given material relative to that of the permittivity of a vacuum.
a)
Permittivity
b)
Static permittivity
c)
Absolute permittivity
d)
Relative permittivity
11.
The symbol for the relative permittivity is:
a)
 εr
b)
ε0
c)
εs
d)
εv
12.
The symbol for the absolute permittivity is:
a)
 εr
b)
ε0
c)
εs
d)
εv
13.
If C= 470μF, V=3V, then
a)
1.71mC
b)
1.51mC
c)
1.61mC
d)
1.41mC
14.
In the capacitor, greater plate area gives: 
a)
greater capacitance
b)
less capacitance
c)
no change
15.
If C is the capacitance in Farads, ϵ permittivity of the dielectric, A area of plate overlap in square meters and d distance between plates in meters, then:
a)
C = ϵd/A 
b)
C = A/ϵd
c)
C = ϵA/d
d)
C = d/ϵA
16.
The capacitance of a parallel-plate capacitor can be increased by: 
a)
increasing the charge 
b)
decreasing the charge 
c)
increasing the plate separation
d)
decreasing the plate separation 
17.
Capacitor C1 and C2 are connected in parallel. The equivalent capacitance is given by: 
a)
C1 + C2
b)
1/(C1 + C2) 
c)
C1C2/(C1 + C2) 
d)
(C1 + C2)/C1C2
18.
If both the plate area and the plate separation of a parallel-plate capacitor are doubled, the capacitance is: 
a)
doubled
b)
halved
c)
unchanged 
d)
one-fourth the original 
19.

A parallel-plate capacitor has a plate area of 0.2 m2 and a plate separation of 0.1 mm. To obtain an electric field of 2.0 x 106 V/m between the plates, the magnitude of the charge on each plate should be:

a)

3.5 x 10-6 C

b)

7.1 x 10-6 C

c)

1.4 x 10-5 C

d)

1.8 x 10-5 C

20.
If the capacitance is 47μF, and the voltage difference across the capacitor terminals is 6V, then the energy stored in that capacitor is:
a)
846×10-6Joule
b)
7.23×10-3 Joule
c)
6.76×10-5Joule
d)
5.94×10-2Joule
21.

Which is the Q vs t graph for the charging process of a capacitor?

a)

a

b)

b

c)

neither

d)

both

22.
If the capacitor is CONNECTED to the battery, what remains constant if the area of the metal plates is increased?
a)
Voltage across the metal plates
b)
Capacitance
c)
Charge stored in the capacitor
d)
Energy stored in the capacitor
23.

Capacitor stores _______________

a)

Charge

b)

Voltage

c)

Energy

d)

Money.. Lots of money

24.

Charge is measured in_________

a)

Coulombs

b)

Farads

c)

Hz

d)

Volts

25.

Capacitance is measured in___________

a)

Coulombs

b)

Farads

c)

Hz

d)

Volts

26.

In RC circuit, and when charging the capacitor, the time constant (τ) is the time needed for the charge of the capacitor to reach ----------- of its maximum charge.

a)

50%

b)

63%

c)

86%

d)

37%

27.

In the RC circuit, the time constant (τ) for the circuit is:

a)

τ = R × C

b)

τ = R / C

c)

τ = R2 × C

28.

In the RC discharging circuit, time constant (τ) is the time taken by the charge of the capacitor to reach ---------------- of the initial charge.

a)

63%

b)

37%

c)

50%

d)

67%

29.

If capacitors are connected in parallel, then potential difference across each capacitor is

a)

same

b)

zero

c)

different

d)

infinite

30.
With respect to the capacitor, which relationship is true?
a)
C = Q/V
b)
V = C×Q
c)
Q = C/V
d)
Q = V/C
31.

Figure shows an arrangement of three capacitors. Calculate the effective capacitance.

a)

2.5 µF

b)

1.7 µF

c)

1.00 µF

d)

1.5 µF

32.

Figure shows an arrangement of three capacitors connected to 12.0 V battery. Calculate the equivalence capacitance.

a)

1.22 µF

b)

4.22 µF

c)

2.22 µF

d)

3.22 µF

33.

Figure  shows a circuit consisting of a switch S,  resistor, 6 V battery and a fully charged  capacitor. If switch S is opened, calculate the remaining charge in the capacitor after 5 s.  

a)

 2.0×10−5C2.0\times10^{-5}C  

b)

 1.8×10−5 C1.8\times10^{-5}\ C  

c)

 3.0×10−5C3.0\times10^{-5}C  

d)

 1.5×10−5C1.5\times10^{-5}C  

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