To all the experts: Ok, in this example, I'm going to have an "ideal" circuit with no ohmic losses, etc. just for ease of calculation... The circuit is connected to a power source with it's own on/off switch. I turn on the power source and........ 1. How fast does the Electric Force transmit around the circuit? 2. How fast does the Magnetic force generated by the moving current propogate away from the wire? I'm imagining that both are moving at either c, or close to that. In a perfect vaccuum, etc. These answers will no doubt lead to future questions.