I've just seen induced electric field concepts. Could anyone provide a link, which explains it? I had some rather stupid doubts regarding it: 1.If a circular conductor is placed in a varying magnetic field, then to find the induced electric field, we take the center of the conductor as origin and get E=(dB/dt)*(r/2) at a distance r from the centre. What if the conductor is not circular, but a rectangle? 2.There is a varying magnetic field. Does it as such produce an electric field, or is the induced electric field produced only when a conductor is placed in the region? 3.What if we have more than one conductor (circular) in the region of varying magnetic field, and we want to find the electric field at some point? Do we apply Principle of Superposition? Thanks.