Consider an isolated and positively charged hollow metallic sphere of finite thickness d, and consider a polar reference system (r, 0, ¢) centred at the sphere centre. Let î be

the radial unitary vector. Mark the correct statement. A. The electric field E inside the hole is such that: E = E, r with E, > 0 B. The electric field E outside the sphere is such that: E = E, î with E, > 0. C. The electric field E inside the hole is such that: E = E, r with E, < 0. D. The surface charge density of the inner surface of the sphere is equal to the surface charge density of the outer surface.[4]