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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Revision Notes for Class 12 Physics Chapter 12 Atoms
Last modified on:3 years agoReading Time:25MinutesRevision Notes for Class 12 Physics Chapter 12 Atoms Thomson’s model of atom: It was proposed by J. J. Thomson in 1898. According to this model, the positive charge of the atom is uniformly distributed throughout the volume of the atom and the negatively charged electrons are embedded in it like…
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MCQ Questions for Class 10 Maths Chapter 15 Probability
Last modified on:3 years agoReading Time:6MinutesHere we are providing MCQ Questions for Class 10 Maths Chapter 15 Probability. Students are suggested to go through each and every question to practice the chapter well. MCQ Questions for Class 10 Maths Chapter 15 Probability Q.1 A number is selected at random from the integers 1 to 100. What…
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Important Derivations for Class 12 Physics Chapter 10 Wave Optics
Last modified on:3 years agoReading Time:11MinutesImportant Derivations for Class 12 Physics Chapter 10 Wave Optics Derivations related to Huygens’ Principle (1) Using Huygens’ principle, verify the laws of reflection at a plane surface. First the wavefront touches the reflecting surface at B and then at the successive points towards C. In accordance with Huygens’ principle, from…
