Problem 11: When a charged object is brought near a neutral insulator, some surf
ID: 2287090 • Letter: P
Question
Problem 11: When a charged object is brought near a neutral insulator, some surface charge is produced on the insulator. The process is called "polarization". Microscopically what happens during polarization? Select one of the Following (a) New electrons are created at the insulator's suurface. (b) Protons move a macroscopic (large) distance through the insulator to produce the excess charge. (c) Electrons move a distance no larger than the size of an atom to produce the excess charge. The atoms are slightly deformed by the force of the external charge. (d) New Protons are created at the insulator's surface (e) Electrons move a macroscopic (large) distance through the insulator to produce the excess charge. Problem 12: A negatively charged rod is brought near a conducting sphere. The sphere is grounded while the rod is near. Does the rod exert a net force on the sphere after grounding? If so, what is the direction of the force on the sphere after the grounding? Select One of the Following (a) The force on the sphere is directed towards the rod. (b) The force on the sphere directed away from the rod. (c) The rod exerts zero net force on the sphere. Problem 13: A non-conductive insulating tube is charged with a plastic bag. When the two objects are held 2em apart the force on the tube from the bag is IN directed inward toward the bag. What is the force of the tube on the bag? Select One of the Following: (a) IN inward toward the tube (b) IN outward away from the tube (c) 2N inward toward the tube (d) 2N outward away from the tube (e) The tube does not exert a force on the bag.Explanation / Answer
11)c
12) the charge induced on the sphere will be opposite to that on the rod thus the force on the sphere will be towardsthe rod
13) force same in magnitude but opposite in direction