Purcell said "One must be alert for every opportunity to bring the students into the world where an electric field is not a symbol merely, but something that crackles." Why does an electric field crackle? Is it because electric fields are lines which connect charges, enabling them to exert forces on each other. When they do exert forces on each other, they move and when that happens, they collide with air particles and other charges around them in inelastic collisions hence release energy such as sound. They will also likely to give off electromagnetic waves since in the collisions they are likely to change directions and accelerate. The sound and light give us the impression of something that crackles i.e. electric spark. But all this can only happen given the existence of electric field lines. Hence electric fields manifest the spark which crackles. In other words, the crackles can only occur in electric fields so electric fields is something that crackles. Correct? This explanation is based on the assumption that electric field exist like the existence of an electron. However, does electric field exist like how electrons exist? I heard it was defined to allow charges to communicate without 'spooky action at a distance'. This also brings about the question of electromagnetic waves. They are regarded exactly as light, which evidently does exist. So electromagnetic waves exist. Does the existence of light or electromagnetic waves suggest the existence of electric fields, given that electromagnetic waves are periodic propagations in the electromagnetic field. There is also the issue of electric field themselves. Are electric fields always attached to charges that extend to infinity (which would mean the field is forever extending it)? But what about when charges come into existence through pair production? Does the field lines propagate at speed c through space to infinite extent at the instand the charge is created? What happens when the electric field reach another charge? Does it exert some momentum on it? I suppose it would if a wave was progating on the tip of the travelling field (which would mean the electron was accelerating non uniformly at the moment of its creation) but not otherwise?