Dielectric material in a capacitor

Electricity and Magnetism Level 2

The above diagram shows a capacitor with dielectric materials between two plates. If we connect this capacitor to a power supply with uniform voltage, which of the following will NOT change due to the existence of the dielectric materials?

The permittivity of the dielectric materials is $\epsilon > 1.$
The permittivity of free space is $\epsilon_0=1.$

electric field strength between the two plates dielectric strength of the capacitor electric capacitance stored electric energy

1 solution

Tom Engelsman
Feb 11, 2018

Given that capacitance $\Rightarrow C = \frac{\epsilon \cdot A}{d}$ , and energy $\Rightarrow E = \frac{1}{2}CV^2 = \frac{1}{2} \cdot \frac{\epsilon \cdot A}{d} V^2$ are both directly proportional to dielectric permittivity, they can certainly change depending on the type of dielectric materials used.

Dielectric strength can be impacted by factors such as operating temperatures, frequencies, or humidity while the capacitor is in operation.

Only the overall electric field between the two plates remains unaffected, thus Choice A is correct.

Dielectric material in a capacitor

1 solution

0 pending reports