एक समांतर प्लेट संधारित्र (parallel plate capacitor) की प्लेटों के बीच की दूरी d है। भिन्न परावैद्युतांक (dielectric constants) K1 और K2 वाली दो पट्टियाँ, जिनकी मोटाई क्रमशः 38d और 12d हैं, संधारित्र में डाली जाती हैं। इसके कारण, धारिता (capacitance) प्लेटों के बीच कुछ न होने की तुलना में दो गुना बड़ी हो जाती है। यदि K1 = 1.25 K2 है, तो K1 का मान 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?