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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Numerical Problems Based on Indirect Methods for Long Distances for Class 11 Physics
Last modified on:5 months agoReading Time:10Minutes Numerical Problems on Indirect Methods for Long Distances Class 11 Physics · Units and Measurements SQ Echo and Measurement Practice Set Apply the echo formula $d = \frac{v \times t}{2}$ and parallax concepts Ch 2 · Units and Measurements 1 In a submarine fitted with a SONAR, the time interval…
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Numerical Problems Based on Electric Flux for Class 12 Physics
Last modified on:5 months agoReading Time:14MinutesElectric flux The term flux implies some kind of flow. Flux is the property of any vector field. The electric flux is a property of electric field. The electric flux through a given area held inside an electric field is the measure of the total number of electric lines of force…
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Numerical Problems Based on Applications of Gauss’s Law for Class 12 Physics
Last modified on:5 months agoReading Time:10Minutes Numerical Problems on Gauss’s Law Applications Class 12 Physics · Electric Charges and Fields SQ Electric Field of Continuous Charge Distributions Apply Gauss’s Law formulas for line charges and infinite plates Ch 1 · Electrostatics 1 An infinite line charge produces a field of $9 \times 10^4\text{ NC}^{-1}$ at a…
