ELECTROMAGNETIC INDUCTION Lecture Notes 1 ELECTROMAGNETIC INDUCTION 1. Motional EMF Potential difference: UKN = ?V = E.L Moving conductor becomes like a battery. [Charge will flow until] equilibrium: Fe=Fm qE = qvB E = vB Therefore: U = E L UKN = vBL B L v? ? ? ?= Same formula applies to a piece of wire also. Formula says: Note: In the formula, all B, L, v, are perpendicular to each other. If they are not, we take the perpendicular components. ? = B L v? ? = B (L Sin?) v ? = B L v Sin?.. (? is between v and L) [Like the trace left by a combine moving across the field. Cutting magnetic field lines is like cutting wheat