x = 0 पर yz-समतल में एकसमान पृष्ठ आवेश घनत्व σ है। एक इकाई बिंदु आवेश को समतल के एक तरफ बिंदु (δ, 0, 0) से दूसरी तरफ बिंदु (-δ, 0, 0) पर ले जाया जाता है। यदि δ एक अत्यंत सूक्ष्म धनात्मक संख्या है, तो आवेश को ले जाने में किया गया कार्य 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?