9 Electric field at a point
due to a system of charges is the
vector sum of the electric fields at
the point due to individual charges Rationalised 2023-24
Electric Charges
and Fields
17
arise instantaneously 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