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CHAPTER 2: CAPACITORS AND DIELECTRICS

Total questions: 31

Worksheet time: 19mins

Name
Class
Date
1.

When 3 capacitors are arranged in series , the equivalent capacitance C is

a)

Ceq = C1 + C2 + C3

b)

1/Ceq = 1/C1 + 1/C2 + 1/C3

c)

Ceq = QV1 + QV2 + QV3

d)

Ceq = CR1 + CR2 + CR3

2.

When 3 capacitors are arranged in parallel , the equivalent capacitance is

a)

Ceq = C1 + C2 + C3

b)

Ceq = 1/C1 + 1/C2 + 1/C3

c)

C = QV1 + QV2 + QV3

d)

1/Ceq = 1/C1 + 1/C2 + 1/C3

3.

The energy stored in the capacitor can be find by using this equation EXCEPT

a)

1/2QV

b)

1/2Q2/C

c)

1/2CV2

d)

1/2RC2

4.

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

5.

During discharging 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

6.

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

7.

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

8.

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

a)

C is directly proportional to the distance d between the plates

b)

C is inversely proportional to the distance d between the plates

c)

C is not affected by the a distance d between the plates

d)

Cinta Antara Engkau Aku dan Dia

9.

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

10.
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 
11.
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 
12.
------------------------ is created out of two metal plates and an insulating material called a dielectric.
a)
An inductor
b)
A capacitor
c)
A fixed resistor
d)
A variable resistor
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 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.
What is the symbol for dielectric permeativity.
a)
ε
b)
εr
c)
ε0
d)
εrε0
16.

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

a)

a

b)

b

c)

neither

d)

both

17.
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
18.

Capacitor stores _______________

a)

Charge

b)

Voltage

c)

Energy

d)

Money.. Lots of money

19.

Charge is measured in_________

a)

Coulombs

b)

Farads

c)

Hz

d)

Volts

20.

Capacitance is measured in___________

a)

Coulombs

b)

Farads

c)

Hz

d)

Volts

21.
The symbol for the relative permittivity is:
a)
 εr
b)
ε0
c)
εs
d)
εv
22.

The symbol for the vacuum permittivity is:

a)

εr

b)

ε0

c)

εs

d)

εv

23.

εr ,ε, ε0 are related to each other according to the following equation:

a)

εr = ε / ε0

b)

εr = ε0 / ε

c)

εr = ε × ε0

d)

ε0 = εr / ε

24.

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%

25.
In the RC circuit, the time constant (τ) for the circuit is:
a)
τ = R × C
b)
τ = R / C
c)
τ = C × R
d)
τ = R2 × C
26.

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%

27.

Which graph best represents the current versus time in the circuit?

a)

A

b)

B

c)

C

d)

D

e)

E

28.

What is a capacitor?

a)

A device for storing energy.

b)

A device for storing p.d.

c)

A device for storing charge.

d)

A device for storing capacitance.

29.

As you charge up a capacitor, what happens to the current through it

a)

Increases

b)

Decreases

c)

Stays the same

d)

Fluctuates

30.

What happens when a parallel plate capacitor is charged with d.c.

a)

Electrons move away from the plate attached to the negative terminal

b)

Electrons move away from the plate attached to the positive terminal

c)

Protons move away from the plate attached to the negative terminal

d)

Protons move away from the plate attached to the positive terminal

31.

What happens to the charge in a capacitor during the discharging process?

a)

Increases over time

b)

Decreases over time

c)

Remains the same

d)

I dont know

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