Electric Field Intensity / Electric Field Strength (E) - Field Theory.
- Electric field due to a charge is the space around the unit charge in which it experiences a force. - Electric field intensity or the electric field strength at a point is defined as the force per unit charge. Mathematically, E = F / Q OR F = E Q - The force on charge Q is the product of a charge (which is a scalar) and the value of the electric field (which is a vector) at the point where the charge is located. - Hence force will be either parallel or anti-parallel to the Electric field intensity. (i.e. Q > 0) the force F points in the same direction as the electric field E. - If the charge is negative (i.e. Q < 0) the force F points in the opposite direction as the electric field E. - Electric field intensity (E) at point r due to a point charge Q located at a point with position vector r 1 is given as: Similarly for N point charges Q 1 , Q 2 ….Q n located at points with position vectors r 1 , r 2 ,….r n , the electric fiel...