Capacitance and Dielectrics SP025

Which of the following defines capacitance?

• The resistance offered by a capacitor to the flow of charge

• The ability of a capacitor to store charge per unit voltage

• The voltage across a capacitor divided by the charge stored

• The energy dissipated in a capacitor during discharge

The SI unit of capacitance is:

• Coulomb (C)

• Farad (F)

• Volt (V)

• Ampere (A)

What is the formula for the energy stored in a capacitor?

• U=CV²

• U=½C²V

• U=½CV²

• U=½C/V²

The effective capacitance of capacitors in parallel is given by

• C_eff = 1/C₁ + 1/C₂ + 1/C₃

• C_eff = C₁ + C₂ + C₃

• C_eff = (C₁ + C₂ + C₃) / (C₁ × C₂)

• C_eff = 1 / (C₁ + C₂ + C₃)

Which of the following is true for capacitors connected in series?

• The total capacitance is the sum of individual capacitances

• The total capacitance is less than the smallest individual capacitance

• The total capacitance is equal to the largest individual capacitance

• The total capacitance is equal to the average of all capacitances

What happens to the capacitance of a parallel plate capacitor if the area of the plates is doubled, keeping the separation constant?

• It is halved

• It doubles

• It remains the same

• It becomes four times greater

What is the effect of introducing a dielectric material between the plates of a capacitor?

• It increases the capacitance

• It decreases the capacitance

• It has no effect on the capacitance

• It increases the voltage across the plates

The time constant (τ) of an RC circuit is defined as:

• The product of resistance and capacitance

• The sum of resistance and capacitance

• The ratio of resistance to capacitance

• The inverse of the resistance times capacitance

Which of the following equations represents the charge on a capacitor during discharge?

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A capacitor stores charge when connected to:

• A resistor

• An inductor

• A power supply

• A switch