Induced Electric Fields

Recall: The potential difference between two points is given by the equation

So for the case of parallel plates, d

When there is a changing magnetic flux through a copper ring, a current is induced. The presence of this current implies a voltage and an electric field.

This electric field is present even without the copper ring.

The induced electric field lines are concentric circles as shown below The induced electric field lines are concentric circles as shown below. Closed paths (red) that enclose changing flux will have a net DV.

Faraday’s Law of EM induction Modified version of Faraday’s Law of EM induction Note that this is for a closed path only… the closed path must enclose a changing magnetic flux for there to be a non-zero DV.

conclusions In general When there is a changing magnetic flux For no changing magnetic flux