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:5 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:5 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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Numerical Problems Based on Derivation of Dimensional Formulae for Class 11 Physics
Last modified on:5 months agoReading Time:10Minutes The dimensional formula of a physical quantity can be obtained by defining its relation, with other quantities, whose dimensions in M, L and T are known. Numerical Problems on Dimensional Analysis Class 11 Physics · Units and Measurements SQ Dimensional Formulae Practice Set Derive dimensions and apply the principle of…
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Numerical Problems Based on Measurement of Time for Class 11 Physics
Last modified on:5 months agoReading Time:6Minutes Numerical Problems on Time Measurement Class 11 Physics · Units and Measurements SQ Time Scales and Accuracy Practice Set Apply dimensional analysis and unit conversions Ch 2 · Units and Measurements 1 Find the number of times the human heart beats in the life of 60 years of a man,…
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Numerical Problems Based on Indirect Methods for Small Distances for Class 11 Physics
Last modified on:5 months agoReading Time:6Minutes Numerical Problems on Indirect Methods for Small Distances Class 11 Physics · Units and Measurements SQ Atomic Volume and Film Thickness Apply volume formulas to estimate molecular dimensions Ch 2 · Units and Measurements 1 The radius of a muonic hydrogen atom is $2.5 \times 10^{-13}\text{ m}$. What is the…
