Capacitance and Capacitors
Physics ⇒ Electricity and Magnetism
Capacitance and Capacitors starts at 11 and continues till grade 12.
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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?
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?
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?
Which combination will give the maximum capacitance? (1) Two capacitors in series (2) Two capacitors in parallel (3) Both give the same capacitance (4) Depends on the voltage
Which of the following best describes a dielectric? (1) A conductor (2) An insulator (3) A semiconductor (4) A resistor
Which of the following is NOT a type of capacitor? (1) Ceramic (2) Electrolytic (3) Inductive (4) Paper
Which of the following is the correct expression for the energy density (u) in the electric field of a parallel plate capacitor? (1) u = ½ε0E2 (2) u = ε0E (3) u = ½CV2 (4) u = QV
A capacitor is said to be fully charged when the potential difference across its plates is equal to the ________ applied.
If the distance between the plates of a parallel plate capacitor is doubled, its capacitance will become ________ of its original value.
The capacitance of a capacitor is independent of the ________ applied across its plates.
The capacitance of a parallel plate capacitor is directly proportional to the ________ of the plates and inversely proportional to the ________ between them.
In an RC circuit, the voltage across the capacitor during charging as a function of time is given by V(t) = V0(1 - e-t/RC). True or False?
The dielectric constant of a material is always greater than or equal to 1. True or False?
True or False: The energy stored in a capacitor is given by U = ½CV2.
