Question

please use Polya method to solve, Prep-include picture, plan, execute, check.

When a potential difference of 250 V is applied to the plates of an air-filled parallel-plate capacitor, the plates carry a surface charge density of 3.00 x 10^-10 C/cm2 . a) What is the spacing between the plates? b) Suppose that the area of the plates is 15 cm^2 , what is the capacitance of the capacitor? c) What energy is stored in the capacitor?

Answer 1

V = 250 V

a)

the spacing between the plates is

b)

the capacitance of the capacitor is

or  

c)

the energy is stored in the capacitor is