Question

Determine a)the capacitance and bthe maximum potencial difference that can be applied to a teflon-filled parallel-plate capacitor having a olate area of 1.75 cm^2 and a plate seperation of 0.040 0 mm.

Answer 1

a)

$$C= ε_ r ε_ 0\frac{A}{d}$$

$$C=2.1(8.854\cdot10^{-12})\frac{1.75\cdot10^{-4}}{4\cdot10^{-5}}=8.13\cdot10^{-11}F$$

b)

$$U=Ed=(60\cdot10^{6})(4\cdot10^{-5})=2400\ V=2.4\ kV$$