Capacitance and Capacitors
Physics ⇒ Electricity and Magnetism
Capacitance and Capacitors starts at 11 and continues till grade 12.
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See sample questions for grade 12
A 10 μF capacitor is charged to 100 V. How much energy is stored in it?
A 20 μF capacitor is connected in series with a 30 μF capacitor. What is the equivalent capacitance?
A 5 μF and a 10 μF capacitor are connected in series. What is their equivalent capacitance?
A capacitor is charged to a potential difference V and then disconnected from the battery. If the plates are pulled apart to double their separation, what happens to the energy stored in the capacitor?
A capacitor of 2 μF is charged to 50 V. It is then connected in parallel to an uncharged 2 μF capacitor. What is the final voltage across both capacitors?
A capacitor of 8 μF is connected in parallel with another of 12 μF. What is the total capacitance?
A parallel plate capacitor has a capacitance of 6 μF. If the area of the plates is doubled and the distance between them is halved, what will be the new capacitance?
A parallel plate capacitor has plates of area 0.2 m2 separated by 1 mm in air. Calculate its capacitance. (Take ε0 = 8.85 × 10-12 C2/N·m2)
Describe one practical application of capacitors in electronic circuits.
Explain the effect of inserting a dielectric slab between the plates of a capacitor.
Explain why a capacitor blocks direct current (DC) after being fully charged but allows alternating current (AC) to pass through.
If a capacitor is connected to a battery and then disconnected, what happens to the charge on the capacitor if the dielectric is removed?
If the potential difference across a 4 μF capacitor is 25 V, what is the charge stored on it?
State one difference between a fixed capacitor and a variable capacitor.
State the formula for the equivalent capacitance of two capacitors, C1 and C2, connected in series.
State the relationship between charge (Q), capacitance (C), and voltage (V) for a capacitor.
What is the SI unit of capacitance?
A capacitor is connected to a battery and reaches steady state. If the battery is then removed and the separation between the plates is halved, what happens to the voltage across the capacitor?
A capacitor of 6 μF is charged to 120 V. It is then connected in series with an uncharged 3 μF capacitor. What is the final voltage across the 3 μF capacitor?
A capacitor of capacitance C is charged to a potential V and then connected across an uncharged capacitor of capacitance 2C. What is the final potential difference across each capacitor?
