- #1
pr_angeleyes
- 9
- 0
Two large non-conducting plates of surface area A = 0.25 m^2 carry equal but opposite charges Q = 75 uC. What is the energy density of the electric field between the two plates?
My attempt:
E=(charge density)/epsilon
And
U=1/2*epsilon*E^2
So
U=0.5(charge density)^2/epsilon
=0.5*(75*10^-6/0.25)^2/(8.85*10^-12)
=5084.75J/m^3 = 5.1 x 10^3 J/m^3
is this right?
My attempt:
E=(charge density)/epsilon
And
U=1/2*epsilon*E^2
So
U=0.5(charge density)^2/epsilon
=0.5*(75*10^-6/0.25)^2/(8.85*10^-12)
=5084.75J/m^3 = 5.1 x 10^3 J/m^3
is this right?