There will be some time delay between the effect
(force on q2) and the cause (motion of q1) It is precisely here that the
notion of electric field (strictly, electromagnetic field) is natural and very
useful The field picture is this: the accelerated motion of charge q1
produces electromagnetic waves, which then propagate with the speed
c, reach q2 and cause a force on q2 The notion of field elegantly accounts
for the time delay