DB/Dt ® E
- Suppose B is increasing into the screen as shown above. An E field is induced in the direction shown. To move a charge q around the circle would require an amount of work =
- This work can also be calculated from e = W/q.
- Faraday's law Þ a changing B induces an emf which can produce a current in a loop.
- In order for charges to move (i.e., the current) there must be an electric field.
- \ we can state Faraday's law more generally in terms of the E field which is produced by a changing B field.