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2024-25 AQA A-Level Physics
7. Fields and their consequences
7.3 Capacitance
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Cards (82)
What is capacitance a measure of?
Ability to store charge
What are the two main types of capacitors described in the material?
Not specified
Understanding the charging and discharging of a
capacitor
is essential for its applications in circuits.
True
Describe the relationship between capacitance, charge, and potential difference.
1️⃣ Capacitance is directly proportional to charge.
2️⃣ Capacitance is inversely proportional to potential difference.
Which material increases capacitance when used between the plates of a capacitor?
Ceramic
What type of proportionality exists between capacitance and permittivity?
Directly proportional
What material property affects capacitance when placed between capacitor plates?
Permittivity
The equation for capacitance is
C = Q/V
Capacitors can be combined in series and
parallel
The unit of capacitance is the
farad
Capacitance is directly proportional to the area of the
plates
.
True
What effect does increasing the surface area of capacitor plates have on capacitance?
Increases capacitance
Using ceramic as a material between
capacitor
plates increases capacitance compared to air.
True
Decreasing the distance between plates increases the
capacitance
Capacitance is inversely proportional to the plate
distance
Capacitance is defined as the ratio of charge stored to potential
difference
Charge is defined as the amount of electric
charge
Smaller plate distance increases
capacitance
.
True
Arrange the factors affecting capacitance based on their effect.
1️⃣ Plate area is directly proportional
2️⃣ Permittivity is directly proportional
3️⃣ Plate distance is inversely proportional
Higher permittivity materials increase
capacitance
.
True
Cylindrical capacitors are known for their high voltage
capability
The reciprocal of the total capacitance in a series configuration is the sum of the reciprocals of the individual
capacitances
What happens to total capacitance in a series configuration as more capacitors are added?
Decreases
What is the total capacitance of two 10 μF capacitors connected in parallel?
20 μF
The energy stored in a capacitor is directly proportional to the square of the voltage.
True
If a capacitor with C = 4 \mu F</latex> is charged to
V
=
V =
V
=
100
V
100 V
100
V
, what is the energy stored?
0.02
J
0.02 J
0.02
J
The unit of capacitance is the
farad
, which equals 1 coulomb per volt.
The capacitance of a capacitor is directly proportional to its plate
area
.
Match the type of capacitor with its key property:
Parallel Plate ↔️ High capacitance, simple design
Cylindrical ↔️ High voltage rating, durable
Spherical ↔️ Uniform electric field, high capacitance
The total capacitance in a series configuration is less than the smallest
individual
capacitance.
True
What are the two main configurations for connecting capacitors?
Series and parallel
Match the capacitor configuration with its property:
Series ↔️ Same current through each
Parallel ↔️ Same voltage across each
A capacitor with
2
μ
F
2 \mu F
2
μ
F
charged to
50
V
50 V
50
V
stores 0.0025 J
A
2
μ
F
2 \mu F
2
μ
F
capacitor connected to a
10
k
Ω
10 kΩ
10
k
Ω
resistor has a time constant of 20 ms
Capacitance increases when the area of the plates decreases.
False
What two factors affect the capacitance of a parallel plate capacitor?
Area and distance
What is the unit of capacitance?
Farad
Larger plates provide more space to store electric charge, increasing the
capacitance
The formula for capacitance is
C
=
C =
C
=
ε
A
d
\frac{\varepsilon A}{d}
d
ε
A
, where ε represents permittivity
Capacitance is inversely proportional to the
distance
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