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(1.30)

This equation simply means that the induced electromotive force (EMF with a unit in V, it is the left‐hand size of the equation expressed in the integral form as shown in Equation (1.37)) is proportional to the rate of change of the magnetic flux. In layman's terms, moving a conductor (such as a metal wire) through a magnetic field produces a voltage. The resulting voltage is directly proportional to the speed of movement. It is apparent from this equation that a time‐varying magnetic field will generate an electric field, i.e. E ≠ 0. But if the magnetic field is not time varying, it will NOT generate an electric field!