Field Energy Flashcards
1
Q
What is the potential energy for a system of n charges?
A
𝒰 = ∑qiVi/2 with
Vi =∑𝒰ij/qi
with j not equal to i
2
Q
What is the energy stored in a capacitor
A
U=QV/2=CV^2/2=Q^2/2C
3
Q
What is the energy density?
A
Energy/volume
4
Q
What is the energy density of a capacitor?
A
u=1/2 ϵ0E^2
