All Flashcards
In the Dielectric Polarization diagram, what does the alignment of molecules in the dielectric create?
A layer of opposite charge on the surface.
In the Dielectric Polarization diagram, what happens to the electric field lines within the dielectric?
Some field lines end on the charges within the dielectric, weakening the overall electric field.
In the Cylindrical Capacitor diagram, what is the charge on the inner cylinder?
+Q
In the Cylindrical Capacitor diagram, what is the charge on the outer cylinder?
-Q
In the Cylindrical Capacitor diagram, what fills the space between the cylinders?
Oil with a dielectric constant k.
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.
Compare the electric field with and without a dielectric.
Without a dielectric, the electric field is stronger. With a dielectric, the induced electric field reduces the overall electric field strength.
Compare the capacitance with and without a dielectric.
Without a dielectric, the capacitance is lower (). With a dielectric, the capacitance is higher ().
Compare the dielectric constant of air and water.
Air has a dielectric constant close to 1 (1.00059). Water has a much higher dielectric constant of 80.
Compare the effect on capacitance of materials with high k vs low k
Materials with high k increase capacitance more than those with low k.
Compare a conductor and a dielectric.
A conductor allows free flow of electrons. A dielectric is an insulator that can be polarized.