Introduction

Introduction

• In the previous chapters, we have studied basic concepts in electrostatic and magnetic fields. These fields do not change with respect to time. Hence such fields are considered as static fields or time invarient fields. In case of static electromagnetic fields, the electric and magnetic fields are independent of each other. In general, the static electric fields are produced by the stationary electric charges. While the static magnetic fields are produced due to the motion of electric charges with uniform velocity or the magnetic charges. Thus we can say the source of an electrostatic field is an electric charge while that of magnetostatic field is the current through filament.

• In this chapter, we will discuss time varying fields or dynamic fields. The time varying fields are produced due to the time varying currents. In case of such dynamic fields, the time varying electric field can be produced by the time varying magnetic field. Similarly the time varying electric field. Thus unlike static fields, in the dynamic or time varying fields, the electric and magnetic fields are interdependent.

• The equations describing relationships between time varying electric and magneting fields are known as Maxwell's equations. These equations can be represented in integral and differential form.