R त्रिज्या के एक वृत्त की परिधि पर क्रमिक आवेशों के बीच समान कोणीय दूरी रखते हुए दस बिंदु आवेश रखे गए हैं। एकांतर आवेशों 1, 3, 5, 7, 9 में से प्रत्येक पर (+q) आवेश है, जबकि 2, 4, 6, 8, 10 में से प्रत्येक पर (-q) आवेश है। वृत्त के केंद्र पर स्थिरवैद्युत विभव V और विद्युत क्षेत्र E क्रमशः क्या होंगे? (अनंत पर V = 0 मानिए):

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?