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6A TEST Capacità e Condensatori

Total questions: 58

Worksheet time: 44mins

Name
Class
Date
1.

sss

a)

a

b)

a

c)

f

d)

j

2.
If the charge on a parallel-plate capacitor is doubled:
a)
the capacitance is halved 
b)
the capacitance is doubled 
c)
the electric field is halved 
d)
the electric field is doubled
3.
The capacitance of a parallel-plate capacitor is: 
a)
proportional to the plate area 
b)
proportional to the charge stored 
c)
independent of any material inserted between the plates 
d)
proportional to the potential difference of the plates 
4.
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 
5.
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 
6.
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 ´ 106 V/m between the plates, the magnitude of the charge on each plate should be:
a)
3.5 ´ 10-6 C
b)
7.1 ´ 10-6 C 
c)
1.4 ´ 10-5 C
d)
1.8 ´ 10-5 C
7.
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
8.
The figure to the right represents:
a)
Capacitor
b)
Diode
c)
Inductor
d)
Resistor
9.
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
10.
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
11.
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
12.
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
13.
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
14.
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.
15.
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.
16.
Which of the following is not a dielectric?
a)
silicon
b)
germanium
c)
polystyrene
d)
titanium
17.
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
18.
What is the symbol for dielectric permeativity.
a)
ε
b)
εr
c)
ε0
d)
εrε0
19.
What is the formula for capacitance in air?
a)
C=
εA/d
b)
C=Q/V
c)
C=
ε0d/A
d)
C=
εoA/d
20.
What happens to capacitance if you  increase the distance of separation of the metal plates?
a)
Increases
b)
Decreases
c)
Remains the same
21.
The symbol of capacitor to the right represents: 
a)
non-polarized fixed
b)
polarized fixed
c)
variable
d)
preset
22.
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
23.
What happens to the current in the circuit during the charging process of a capacitor?
a)
Decreases over time
b)
Increases over time
c)
Remains constant
24.
The following are factors affecting capacitance, except.
a)
Dielectric in between the metal plates
b)
Area  of the metal plates
c)
Distance of separation of the metal plates
d)
Voltage across the metal plates
25.
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
26.

With respect to the capacitor, which relationship is true? •

a)

C = Q×V

b)

V = C×Q

c)

V = Q/C

d)

Q = C/V

27.
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
28.

How is the capacitance (C) of a parallel-plate capacitor affected by the charge on the plates ?

a)

C depend on the charge on the plates

b)

C is vanished when there are plates

c)

C does not depend on the charge on the plates

d)

C is accumulated on one side only

29.

How is the capacitance of a parallel-plate capacitor affected by the potential difference across the capacitor ?

a)

C depend on the potential difference across the capacitor

b)

C does not depend on the potential difference across the capacitor

c)

C partially depend on the potential difference across the capacitor

d)

C sometime depend on the potential difference across the capacitor

30.

How is the capacitance of a parallel-plate capacitor affected by the area of each plate?

a)

C is directly proportional to the area A of each plate

b)

C is inversely proportional to the area A of each plate

c)

C is partially proportional to the area A of each plate

d)

C is fully proportional to the area A of each plate

31.

How is the capacitance of a parallel-plate capacitor affected by the distance between the plates ?

a)

C is directly proportional to the area A of each plate

b)

C is inversely proportional to the distance d between the plates

c)

C is partially proportional to the area A of each plate

d)

C is not affected by the area A of each plate

32.

How is the capacitance of a parallel-plate capacitor affected by filling the space between the plates with an insulator ?

a)

C stable when the space between the plates is filled with an insulator, εr >1

b)

C reduces when the space between the plates is filled with an insulator, εr >1

c)

C increases when the space between the plates is filled with an insulator, εr >1

d)

C fluctuate when the space between the plates is filled with an insulator, εr >1

33.
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
34.
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
35.

The plates of a parallel-plate capacitor are 2.50mm apart, and each carries a charge of magnitude 80.0nC. The plates are in vacuum. The electric field between the plates has a magnitude of 4.00x106V/m. What is the potential difference between the plates?

a)

2.00x104V

b)

1.75x104 P.D.

c)

1.00x10-4P

d)

1.00x104V

e)

not solvable! because capacitor has no potential difference because it should have an insulator in between.

36.

from question 16:


The plates of a parallel-plate capacitor are 2.50mm apart, and each carries a charge of magnitude 80.0nC. The plates are in vacuum. The electric field between the plates has a magnitude of 4.00x106V/m.


What is the area of each plates?

a)

2.26x10-3cm2

b)

2.26x10-3m2

c)

22.6m2

d)

2.26cm2

e)

none of the above

37.

The plates of a parallel-plate capacitor are 2.50mm apart, and each carries a charge of magnitude 80.0nC. The plates are in vacuum. The electric field between the plates has a magnitude of 4.00x106V/m.


what is the capacitance?

a)

zero

b)

same as potential difference 4.00pF

c)

8.99pF

d)

8pF

e)

8.00x10-9F

38.

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

39.

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

40.

During charging a capacitor through a resistor

a)

the current in the circuit increases linearly with time

b)

the current in the circuit decreases linearly with time

c)

the current in the circuit increases exponentially with time

d)

the current in the circuit decreases exponentially with time

41.

1. A ____________ connection has 2 or more components connected so that there is more than one path for current to flow.

a)

series

b)

parallel

c)

series/parrallel

d)

polarized

42.

2. A ____________ connection has 2 or more components connected so that there is only 1 path for current to flow

a)

perpendicular

b)

parallel/series

c)

polarized

d)

series

43.

6. The total capacitance of two capacitors connected in series is _____________ the lowest value capacitor

a)

equal to

b)

opposite

c)

greater than

d)

less than

44.

7. Electrical prints use standard symbols and abbreviations to show ___________ operation and device use.

a)

battery

b)

circuit

c)

switch

d)

capacitor

45.
Each of the four capacitors shown is 500 mF.  The voltmeter reads 1000V.  The magnitude of the charge on each capacitor plate is:
a)
0.2 C
b)
0.5 C
c)
20 C
d)
50 C
46.
Two identical capacitors are connected in series and two, each identical to the first, are connected in parallel. The equivalent capacitance of the series connection is ________ the equivalent capacitance of parallel connection. 
a)
twice
b)
four times 
c)
half 
d)
one fourth
47.
Capacitors C1 and C2 are connected in parallel and a potential difference is applied to the combination. If the capacitor that is equivalent to the combination has the same potential difference, then the charge on the equivalent capacitor is the same as: 
a)
the charge on C1
b)
the sum of the charges on C1 and C2
c)
the difference of the charges on C1 and C2
d)
the product of the charges on C1 and C2
48.

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

a)

1.33μF

b)

0.75μF

c)

6μF

d)

2μF

49.

A 130 mF capacitor and a 150 mF capacitor are each connected across a 6 V dc source. The voltage

across the 330 pF capacitor is ?

a)

8 Volts

b)

6 Volts

c)

4 Volts

d)

2 Volts

50.

If the maximum amount of charge held by a capacitor at a voltage of 12V is 36C, what is the capacitance of this capacitor?

a)

0.33 Volts

b)

3 Volts

c)

24 Volts

d)

432 Volts

51.

Combined capacitance is equal to the ?

a)

sum of all capacitance of capacitors

b)

product of all the capacitance

c)

difference between the capacitors

d)

average between the capacitors

52.

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

a)

same

b)

zero

c)

different

d)

infinite

53.

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

54.
The amount of charge that a capacitor can accept is determined by 
a)
It's capacity C=Q/V
b)
the plate area
c)
the dielectric thickness
d)
all of the above
55.
When a capacitor discharges
a)
current reverses direction compared to the charge current
b)
it acts like a DC open
c)
the electrostatic charge remains 
d)
plate voltage increases
56.
Capacitance is inversely proportional to 
a)
a charge
b)
dielectric thickness 
c)
plate area
d)
applied voltage
57.
Capacitors well hold a charge until
a)
the applied voltage drops to zero
b)
5 time constants
c)
an external discharge path is provided
d)
1 time constant
58.

Connecting capacitors in parallel effectively causes the _____ ________

a)

distance between the plates , increase

b)

distance between the plates , decrease

c)

plate area increase

d)

plate area decrease

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