Capacitor revision

Which of the following best describes the unit of capacitance

• Ohm (Ω)
• Volt (V)
• Watt (W)
• Farad (F)

A capacitor is charged so that it stores a charge of 6 μC at a potential difference of 12 v. What is its capacitance?

• 2.5 μF
• 1.0 μF
• 0.2 μF
• 0.5 μF

Three capacitors of 4μF 6μF 12μF are connected in series. What is the total capacitance?

• 4μF
• 6μF
• 12μF
• 2μF

If two capacitors, each of10 μF, are connected in parallel, what is the total capacitance?

• 10 μF
• 30 μF
• 5 μF
• 20 μF

Which of the following statements about dielectric materials is correct?

• Dielectric materials can be polarized by an electric field.
• Dielectric materials conduct electricity easily.
• Dielectric materials have no effect in an electric field.
• Dielectric materials are always magnetic in nature.

What is the main function of a dielectric in a capacitor?

• To store electrical energy without affecting capacitance.
• To decrease the voltage across the capacitor.
• To act as a conductor between the plates of the capacitor.
• The main function of a dielectric in a capacitor is to increase its capacitance.

Which of the following is NOT a common application of capacitors?

• Power generation
• Signal filtering
• Energy storage
• Mechanical systems

A100 μF capacitor is connected to a12 V battery. How much charge is stored on the capacitor?

• 1200 μC
• 1800 μC
• 600 μC
• 2400 μC

Which equation correctly relates the charge Q, capacitance C, and voltage V for a capacitor?

• Q = C * V
• V = Q - C
• C = Q + V
• Q = V / C

What happens to the total capacitance when more capacitors are added in parallel to a circuit?

• The total capacitance becomes zero.
• The total capacitance decreases.
• The total capacitance remains the same.
• The total capacitance increases.