त्रिज्या R और कुल आवेश Q वाले एक समान रूप से आवेशित पतले गोलाकार कोश (spherical shell) की कुल स्थिरविद्युत स्व-ऊर्जा (electrostatic self-energy) किसके अनुक्रमानुपाती होती है?

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?