Question 442: Electrostats & Capacitance

Question

The function of a dielectric in a capacitor is

Accepted Answer

The correct answer is:
Option A: to reduce the effective potential on plates.
Explanation:
A dielectric is an insulating material placed between the plates of a capacitor.
When a dielectric is inserted, the electric field inside the capacitor decreases because the dielectric becomes polarized.
For the same charge stored on the plates, a lower effective potential difference exists across them.
This leads to
increased capacitance
according to
$ C = \kappa \cdot C_0 $
where $\kappa$ is the dielectric constant, $C_0$ is the capacitance without the dielectric.
Hence, the dielectricÃ¢ÂÂs role is essentially to
reduce the effective potential
on the plates, thereby increasing capacitance. Ã¢ÂÂ

Answer

to reduce the effective potential on plates,

Answer

to increase the effective potential on plates.

Answer

to decrease the capacity of capacitance.

Answer

to reduce the plate area of the capacitor.

Electrostats & Capacitance

The function of a dielectric in a capacitor is

Choose the correct answer: