Capacitance is a measure of a capacitor's ability to store electric charge. A capacitor consists of two conductors separated by an insulator. When a potential difference (voltage) is applied across the conductors, an electric field is created, allowing the capacitor to store energy. The capacitance ($C$) is defined as the ratio of the charge ($Q$) stored on each conductor to the potential difference ($V$) between them: $C = \frac{Q}{V}$. Understanding how capacitance is affected by geometry (plate area and separation) and dielectric materials is crucial for solving AP Physics 1 problems.
Match the terms with their definitions:
| Term | Definition |
|---|---|
| 1. Capacitance | A. The insulating material between capacitor plates. |
| 2. Dielectric | B. The ability of a capacitor to store charge. |
| 3. Capacitor | C. The amount of charge stored per unit voltage. |
| 4. Electric Field | D. A device used to store electrical energy. |
| 5. Voltage | E. The potential difference between two points, measured in volts. |
Match the correct term to the definition.
Complete the following paragraph using the words provided: charge, voltage, farads, energy, electric field.
A capacitor stores electrical _______ when a _______ is applied across its plates, creating an _______. The amount of _______ a capacitor can store depends on its capacitance, measured in _______. The relationship between these quantities is expressed as $Q = CV$, where $Q$ is charge, $C$ is capacitance, and $V$ is _______.
Explain how increasing the distance between the plates of a parallel-plate capacitor affects its capacitance and why. Use the equation for capacitance of a parallel-plate capacitor, $C = \frac{\epsilon_0 A}{d}$, where $A$ is the area of the plates, $d$ is the distance between them, and $\epsilon_0$ is the permittivity of free space, in your explanation.
Please log in to post your answer.
Log InEarn 2 Points for answering. If your answer is selected as the best, you'll get +20 Points! 🚀