All Flashcards
What are the differences between capacitance with and without a dielectric?
Without Dielectric: Capacitance depends only on plate area and separation. | With Dielectric: Capacitance is increased by a factor of the dielectric constant.
What are the differences between electric field inside and outside a capacitor?
Inside: Uniform, constant magnitude and direction (except near edges). | Outside: Ideally zero, but practically negligible.
What are the differences between energy storage in a capacitor and a battery?
Capacitor: Stores energy electrostatically, releases quickly. | Battery: Stores energy chemically, releases more slowly.
What are the differences between the effects of increasing plate area vs. decreasing plate separation on capacitance?
Increasing Plate Area: Increases capacitance directly. | Decreasing Plate Separation: Increases capacitance inversely.
What are the differences between the electric field with and without a dielectric?
Without Dielectric: Electric field depends on charge and plate area. | With Dielectric: Electric field is reduced due to polarization of the dielectric.
Label the parts of a parallel plate capacitor diagram.
1: Positive Plate (+), 2: Negative Plate (-), 3: Distance (d), 4: Electric Field Lines
How does inserting a dielectric affect capacitance?
- Dielectric material is inserted. 2. Dielectric becomes polarized. 3. Internal electric field opposes the original field. 4. Effective electric field is reduced. 5. Capacitance increases.
How to calculate the capacitance of a parallel-plate capacitor?
- Identify the dielectric constant (κ). 2. Measure the area of one plate (A). 3. Measure the distance between plates (d). 4. Use the formula:
How to calculate the electric field between capacitor plates?
- Determine the charge (Q) on each plate. 2. Identify the dielectric constant (κ). 3. Measure the area of one plate (A). 4. Use the formula:
How to calculate the energy stored in a capacitor?
- Determine the charge (Q) on each plate and the potential difference (ΔV). 2. Use the formula: or
What are the steps of charging a capacitor?
- Connect the capacitor to a voltage source. 2. Electrons flow from one plate to the other. 3. One plate becomes positively charged, the other negatively. 4. Charging stops when the potential difference equals the source voltage.