एक आवेश +q को मुक्त आकाश में अनंत से एक अनंत भू-संपर्कित (grounded) चालक धातु के समतल के सामने d दूरी पर एक स्थिति तक लाने में किया गया कार्य W = -α q232πε0d द्वारा दिया जाता है। α का मान क्या 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?