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DP IB Physics: HL
Topic Questions
11.3 Capacitance
Question 2
The graph shows how the potential difference across a capacitor varies with the charge stored by it.
Which one of the following statements is incorrect?
The charge and potential difference are directly proportional to each other
The energy stored in the capacitor is the area under the graph
The gradient of the line equals the capacitance
The gradient of the line equals the reciprocal of the capacitance
Question 3
Which row in the table shows the correct units for capacitance, C, charge, q and potential difference, V?
| C | q | V | |
| A. | C | V | P |
| B. | F | C | V |
| C. | C | C | V |
| D. | F | A | V |
Question 4
What is the capacitance of a capacitor in a circuit with a time constant of 60 s when it is discharged through a 15 Ω resistor?
1 F
2 F
3 F
4 F
Question 5
Which statement about the effect of dielectric materials on capacitance is incorrect?
The larger the opposing electric field from the polar molecules in the dielectric, the larger the permittivity
When the polar molecules in a dielectric align with the applied electric field from the plates they each produce their own electric field
The electric field from the polar molecules opposes the electric field from the plates, reducing the overall electric field
The dielectric material is an electrical conductor
Question 6
A capacitor has a time constant, 
.
Which definition of is incorrect?
The time taken for a charging capacitor's potential difference to reach 63% of its maximum value.
The time taken for a discharging capacitor's potential difference to decrease to 63% of its original value.
The time taken for a discharging capacitor's potential difference to decrease to its original value multiplied by a factor of
.The product of the resistance of the resistor and the capacitance of the capacitor.
Question 7
Which of the following series of graphs shows the correct charging graphs for a capacitor?
Question 8
The shaded area on the graph represents the energy stored in a capacitor.
What quantity is missing on the label of the Y axis?
Energy
Charge
Voltage
Capacitance
Question 9
A capacitor is discharging. The initial current is given by I0 .
What is the current when a time has passed equal in length to the time constant?
Question 10
Which of the following shows the correct discharging graphs for a capacitor?
