निम्नलिखित कथनों पर विचार करें और सही विकल्प का चयन करें। कथन I: किसी संधारित्र (capacitor) की धारिता प्लेटों के क्षेत्रफल और माध्यम के परावैद्युतांक (dielectric constant) के सीधे अनुक्रमानुपाती होती है। कथन II: प्लेटों के बीच की दूरी बढ़ने पर संधारित्र की धारिता घट जाती 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?