AP Physics C: Electricity and Magnetism / Unit 10: Conductors and Capacitors
10.4 Dielectrics
Notes
Inserting a dielectric ($\kappa>1$) increases capacitance: $C=\kappa C_0$.
- The dielectric polarizes, reducing the field between the plates.
Practice
Inserting a dielectric with $\kappa=3$ makes $C$:
$\kappa C_0$.
With the battery still connected, adding a dielectric makes the stored charge:
$Q=CV$ with $V$ fixed.
A dielectric reduces the field between plates because:
Induced dipoles.
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