An insulating sphere of radius a,centered at the origin, has a uniform volume charge density rho.
A spherical cavity is excised from the inside of the sphere.The cavity has radius a\4 and is centered at position h_vector, where|vector of h| < 3/4 a, so that the entire cavity is contained within thelarger sphere. Find the electric field inside the cavity.
Express your answer as a vector interms of any or all of rho,epsilon_0, r_vector, and h_vector