The electric field intensity 2m from the surface of a charged sphere is 30.86 x103 N/C. The charge density at the surface of the sphere is 8.85 x 19?7 coul/m2 . What is the radius of the sphere ?

? Hint: The Gaussian surface area of the big sphere of radius, r + 2 is : A = 4? (r +2 )2 Ans. r = 2.5 m

The electric field intensity 2m from the surface of a charged sphere is 30.86 x103 N/C. The charge density at the surface of the sphere is 8.85 x 19-7 coul/m2. What is the radius of the sphere ? Hint: The Gaussian surface area of the big sphere of radius, r + 2 is : A = 4n (r +2 )? Ans. r = 2.5 m