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  Question 1. In comparison With the electrostatic force between two electrons, the electrostatic force between two protons is: (a) greater (b) smaller (c) zero (d) same. Answer Answer: (d) same. Question 2. If electric flux through a closed surface is zero. It means that: (a) the net charge inside the surface is zero. (b) the electric field is necessarily zero at all points on the surface. (c) no charge exists inside the surface. (d) no charge exists outside the surface. Answer Answer: (a) the net charge inside the surface is zero. Question 3. Static electricity is produced by (a) induction only (b) friction (c) chemical reaction only (d) friction and induction both. Answer Answer: (b) friction Question 4. When distance between two charges is reduced to one-half of the original distance, the force between them will remain the same if one of the charges is made: (a) one fourth (b) four times (c) double (d) one-halftimes. Answer Answer: (a) one fourth Question 5. A unit Coulomb char...

 All of us have the experience of seeing a spark or hearing a crackle when we take off our synthetic clothes or sweater, particularly in dry weather.This is almost inevitable with ladies garments like a polyester saree. Have you ever tried to find any explanation for this phenomenon? Another common example of electric discharge is the lightning that we see in the sky during thunderstorms. We also experience a sensation of an electricshock either while opening the door of a car or holding the iron bar of abus after sliding from our seat. The reason for these experiences is discharge of electric charges through our body, which were accumulated due to rubbing of insulating surfaces. You might have also heard that this due to generation of static electricity. This is precisely the topic we are going to discuss in this and the next chapter. Static means anything that does not move or change with time. Electrostatics deals with the study of forces, fields and potentials arising from stat...