Answer to Question #313842 in Electric Circuits for Cyn

Question

You are to construct a parallel plate capacitor out of two flat plate of area 25 cm^2. You

have three dielectrics to choose from: 1 cm thick paraffin, 2 cm thick Pyrex glass, and 3 cm thick Porcelain which of the dielectric will you used to get the maximum capacitance?

Answer 1

Explanations & calculations

• The capacitance is given by the formula $\small C = \epsilon.\epsilon_0.\large \frac{A}{d}$ in relation to the other parameters.
• To increase the capacitance $\epsilon \uparrow\quad d\downarrow$.
• According to the tabulated research data, the given material can be listed as per their relative permittivities in the ascending order as follows.

$\qquad\quad\small Paraffin(2.1-2.5) \to Porcelain(5.0-7.0) \to Glass(3.0-10.0)$

• In overall, therefore, along with that moderate thickness, Pyrex glass can be selected as the most suitable dielectric material.