While deriving energy density of a magnetic field via using an inductor, why dont we consider the energy stored outside of inductor also?
As initially the field was there outside the inductor, (may be very very far away), but afterwards it is gone..and along woth it the energy stored in it..
If this energy outside the inductor doesnt come in form of heat through resistor , then where does it go?
I am talking about the derivation in which an ideal inductor carrying current i is brought in contact with resistor and heat liberated through resistor ($\frac12LI^2$) = energy stored outside inductor + energy stored inside inductor.
I dont understand how people put that outside energy term = 0. As many field lines would exist inside inductor.. So many would outside