To start the analysis of this circuit you must write energy conservation (loop) equations. Each equation must involve a round-trip path that begins and ends at the same location. Each segment of the path should go through a wire, a bulb, or a battery (not through the air). How many valid energy conservation (loop) equations is it possible to write for this circuit? 3 Which of the following equations are valid energy conservation (loop) equations for this circuit? Ei refers to the electric field in bulb #1, L refers to the length of a bulb filament, etc. Assume that the electric field in the connecting wires is small enough to neglect. EiL - E2L = 0 +E2L - E3L = 0 EL - E3L = 0 +2*emf - EiL - E3L = 0 +2*emf - EzL- EzL - E3L = 0 +2*emf - EiL - EzL = 0 +2"emf - E2L - E3L = 0 It is also necessary to write charge conservation equations (node) equations.