A point charge produces an electric field of magnitude 5.0 NC−1 at a distance of 40 cm from it. What is the magnitude of charge?
8.9×10−11 C
Given that,
E = 5.0 NC−1 as given
Distance is given as 40 cm=0.4 m
We know |→E|=14πε0Qr2
So 5.0=9×109×Q(0.4)2⇒Q=8.9×10−11C