A metal sphere with a diameter of 10 cm has a charge distribution of 1.09085 x 1018 electrons/cm2 on its surface. What is the electric field strength at a distance of 25 cm from the surface of the sphere? (Answer: 5.5 x 1012 N/C)
I wasn't given any equations. Only ones I know are
E= F/q= (kqQ/r2)/q
E= k x Q/r2
The Attempt at a Solution
E= (k x Q)/r2= 9.0 x 109 x Q/ 25 cm2= ?