The true physical significance of the concept of electric field, however,
emerges only when we go beyond electrostatics and deal with time-
dependent electromagnetic phenomena Suppose we consider the force
between two distant charges q1, q2 in accelerated motion Now the greatest
speed with which a signal or information can go from one point to another
is c, the speed of light Thus, the effect of any motion of q1 on q2 cannot
FIGURE 1