Electric Charge Is Uniformly Distributed Inside a Nonconducting Sphere of Radius

Multiple Choice

Electric charge is uniformly distributed inside a nonconducting sphere of radius 0.30 m. The electric field at a point P, which is 0.50 m from the center of the sphere, is 15,000 N/C and is directed radially outward. At what distance from the center of the sphere does the electric field have the same magnitude as it has at P?

A) 0.11 m
B) 0.13 m
C) 0.15 m
D) 0.17 m
E) at no other point