एक समानांतर-प्लेट संधारित्र (parallel-plate capacitor) पर विचार करें, जिसकी प्रत्येक प्लेट का क्षेत्रफल S है और वे d दूरी पर स्थित हैं। मान लें कि प्लेट 1 और 2 पर क्रमशः +Q और -Q आवेश समान रूप से वितरित हैं। संधारित्र में संचित ऊर्जा कितनी 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?