Question

An electrically charged particle generates an electric field around it. The strength, E,
of the electric field (in NC^-1 ) is directly proportional to the size of the charge on the
particle, Q (in Coulombs, C), and inversely proportional to the square of the distance
from it, d, in metres.
(a) Set up the proportionality relationship. (1 mark)
(b) Find the constant of proportionality if the electric field strength 3.00cm from a
3.5microC charge is 3.5*10^7 NC^-1