Table of Contents
Charging of Insulators
Since charge cannot flow through insulators, neither conduction nor induction can be used to charge, insulators, so in order to charge an insulator friction is used. Whenever an insulator is rubbed against a body exchange of electrons takes place between the two. This results in appearance of equal and opposite charges on the insulator and the other body. Thus the insulator is charged.
For example rubbing of plastic with fur, silk with glass causes charging of these things.
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COULOMB’S LAW
Last modified on:3 years agoReading Time:18MinutesCOULOMB’S LAW: Two point electric charges q1 and q2 at rest, separated by a distance r exert a force on each other whose magnitude is given by If between the two charges there is free space then Where ε0 is the absolute electric permittivity of the free space and ε0 =…
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If we comb our hair on a dry day and bring the comb near small pieces of paper, the comb attracts the pieces, why?
Last modified on:4 years agoReading Time:2Minutes If we comb our hair on a dry day and bring the comb near small pieces of paper, the comb attracts the pieces, why? Answer: This is an example of frictional electricity and induction. When we comb our hair, it gets positively charged by rubbing. When the comb is brought…
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Can two similarly charged bodies attract each other?
Last modified on:4 years agoReading Time:1Minute Yes, when the charge on one body Q is much greater than that on the other q and they are close enough to each other so that force of attraction between Q and induced charge on the other exceeds the force of repulsion between Q and q. However, two similar…
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CBSE Class 12 Chemistry Revision Notes Chapter-2 Solutions
Last modified on:5 years agoReading Time:14MinutesSolution : A perfectly homogeneous mixture of two or more components is called solution. Solute : The component which is present in lesser amount or whose physical state is changed during the formation of solution is called solute. Solvent : The component which is present in larger amount and determines the…
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CBSE Class 12 Physics Revision Notes Chapter-11 Dual Nature of Matter and Radiation
Last modified on:5 years agoReading Time:12MinutesElectron emission: The phenomenon of emission of electrons from the surface of a metal. The minimum energy needed by an electron to come out from a metal surface is known as “work function” of the metal. It is denoted by Φ0 or W0 and measured in electron volt (eV). Work function…
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NEET Physics Class 12 Questions Chapter-1 Electric Charges and Fields
Last modified on:5 years agoReading Time:6MinutesQ.1. If a body has positive charge on it, then it means it has(1) Gained some protons (2) Lost some protons(3) Gained some electrons (4) Lost some electrons Sol. Answer (4)Due to lack of electron body get positive charge. Q.2. Sure check for presence of electric charge is(1) Process of induction…
