Question

can anybody explain on solution to challenge problems no. 1 on (4. Electric Fields and Continuous Charge Distributions), dE = dq/(4*pi*Eo*r^3) r^ , why it's r^3? for some i thought it should be r^2.

Answer 1

its not r^3
its vector form of r^2 where r^ is unit vector. . .
vector form of r^2 is = r^3/r^

Answer 2

thanks..