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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Physics VSQs for Class 11 with Answers Chapter 12 Thermodynamics
Last modified on:5 years agoReading Time:10Minutes Very Short Answer Type Questions [1 Mark Each] Q.1. Is the heat supplied to a system always equal to the increase in its internal energy? Answer Answer: From 1st law of thermodynamics, dQ = dU + dW If dW = 0, then dQ = dU. i.e. if heat is supplied…
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Physics VSQs for Class 11 with Answers Chapter 10 Mechanical Properties of Fluids
Last modified on:5 years agoReading Time:12MinutesVery Short Answer Type Questions [1 Mark Each] Q.1. When a vessel containing a liquid is falling freely, does Archimedes’ principle hold good in it? Answer Answer: No – because in fall Buoyant force doesn’t exist. Q.2. A block of wood floats in a bucket of water in a lift. Will…
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Motion in 1-D (Revision Notes for JEE/NEET)
Last modified on:5 years agoReading Time:1MinutePOSITION AND FRAME OF REFERENCE DISPLACEMENT AND VELOCITY DISTANCE AND SPEED GRAPHS Applications MOTION UNDER GRAVITY SOME IMPORTANT POINTS: 10 Important Points RELATIVE MOTION IN ONE DIMENSION
