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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MCQ Questions for Class 12 Biology Chapter 1 Reproduction in Organisms
Last modified on:4 years agoReading Time:14MinutesMCQ Questions for Class 12 Biology Chapter 1 Reproduction in Organisms Q.1. The term ‘clone’ cannot be applied to offspring formed by sexual reproduction because(a) offspring do not possess exact copies of parental DNA(b) DNA of only one parent is copied and passed on to the offspring(c) offspring are formed at…
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Circular Motion Revision Notes for JEE Main Physics
Last modified on:4 years agoReading Time:2MinutesCircular Motion Revision Notes for JEE Main Physics Here we are providing revision notes for JEE Main Physics Chapter Circular Motion. This revision notes on Circular Motion covers all important facts and formulae. Students can use these revision notes for their last minute preparation. This helps in covering the whole chapter…
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Projectile Motion Revision Notes for JEE Main Physics
Last modified on:4 years agoReading Time:2MinutesProjectile Motion Revision Notes for JEE Main Physics Here we are providing revision notes for JEE Main Physics Chapter Projectile Motion. This revision notes on Projectile Motion covers all important facts and formulae. Students can use these revision notes for their last minute preparation. This helps in covering the whole chapter…
