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 Combination of Errors for Class 11 Physics
Last modified on:5 months agoReading Time:11Minutes Numerical Problems on Propagation of Errors Class 11 Physics · Units and Measurements SQ Error Propagation Practice Set Apply rules for addition, subtraction, multiplication, division, and powers Ch 2 · Units and Measurements 1 If $A = (12.0 \pm 0.1)\text{ cm}$ and $B = (8.5 \pm 0.5)\text{ cm}$, find (i)…
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Numerical Problems Based on Errors in Measurements for Class 11 Physics
Last modified on:5 months agoReading Time:10Minutes Numerical Problems on Error Analysis Class 11 Physics · Units and Measurements SQ Error Calculation Practice Set Apply formulas for mean, absolute error, relative error, and percentage error Ch 2 · Units and Measurements 1 The diameter of a wire as measured by a screw gauge was found to be…
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Numerical Problems Based on Significant Figures for Class 11 Physics
Last modified on:5 months agoReading Time:14Minutes The significant figures are normally those digits in a measured quantity which are known reliably or about which we have confidence in our measurement plus one additional digit that is uncertain. The larger the number of significant figures in a measurement, the higher is the accuracy of the measurement. Suppose…
