All Flashcards
Compare the electric field with and without a dielectric.
Without dielectric: Stronger electric field. | With dielectric: Weaker electric field due to polarization.
Compare the capacitance with and without a dielectric.
Without dielectric (): Lower capacitance. | With dielectric (): Higher capacitance.
Compare the potential difference with and without a dielectric (capacitor disconnected from battery).
Without dielectric: Higher potential difference. | With dielectric: Lower potential difference.
Compare the energy stored with and without a dielectric (capacitor disconnected from battery).
Without dielectric: Higher energy stored. | With dielectric: Lower energy stored.
Compare the electric field induced within the dielectric vs. the overall electric field between the plates.
Induced electric field: Reduces the overall field. | Overall electric field: Determines the voltage and capacitance.
What is the effect of inserting a dielectric into a capacitor?
It increases the capacitance by allowing more charge to be stored at the same voltage and reduces the electric field strength.
What is the effect of polarization of dielectric molecules?
Creates a layer of opposite charge on the surface, attracting more charge onto the capacitor plates, increasing capacitance.
What happens to the electric field when a dielectric is inserted?
The overall electric field between the plates is weakened due to the induced electric field within the dielectric.
What happens to the voltage when a dielectric is inserted at constant charge?
The voltage is reduced because V = Ed, and the electric field (E) is reduced.
What happens to capacitance when voltage decreases at constant charge?
Capacitance increases, because C = Q/V.
Cause: Inserting a dielectric into a capacitor.
Effect: Increases capacitance by allowing more charge to be stored at the same voltage.
Cause: Polarization of a dielectric material.
Effect: Creates a layer of opposite charge on the surface, attracting more charge onto the capacitor plates.
Cause: Increased charge storage in a capacitor.
Effect: Increases capacitance.
Cause: Inserting a dielectric reduces the electric field.
Effect: Increases capacitance.
Cause: Removing a dielectric from a charged capacitor disconnected from a battery.
Effect: The potential difference between the plates increases.
Cause: Inserting a dielectric into a charged capacitor disconnected from a battery.
Effect: The potential difference between the plates decreases.