find the electric potential of a sphere with a radius of 4m and a +2 total electric charge at 2m.?

Question

is the answer 0 for anything under the 4m

or would it be k2/2

Answer 1

If x <= r, V = kQ/r (because inside a sphere the field = 0, thus there's no change in potential)
Else V = kQ/x
So if it's 2 m from the center, V = kQ/4; if it's 2 m from the nearest part of the sphere, V = kQ/6.