A neutral conducting sphere of radius R is placed in a uniform electric field of magnitude E0 pointing along the z-axis. The electrostatic potential at any point r (r > R) outside the sphere is given by V(r, θ) = V0 - E0r(1 - R3/r3)cos(θ), where V0 is the constant potential of the sphere. Which of the following statements is correct?

Which of the following statements are correct regarding electrostatic properties of conductors? A. Inside a conductor, the electrostatic field is zero. B. Electric field at the surface of a charged conductor does not depend on its surface charge density. C. The interior of a charged conductor can have no excess charge in static conditions. D. At the surface of a charged conductor, the electrostatic field must be normal to the surface at every point. E. The electrostatic potential is zero everywhere inside a charged conductor. Choose the correct answer:

What type of electric charge is acquired by a glass rod when it is rubbed with a silk cloth?