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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Rectilinear Motion & Projectile motion
Last modified on:8 years agoReading Time:1MinuteSECTION – I Straight Objective Type This section contains 15 multiple choice questions. Each question has choices (A), (B), (C), and (D) out of which ONLY ONE is correct.
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CBSE Class 9 Physics GRAVITATION
Last modified on:5 years agoReading Time:14Minutes Gravitational Force of Earth If we release a small stone without pushing it from a height, it accelerates towards earth. The stone is when accelerated towards earth, means some force is acting on it. The force which pulls the objects towards the centre of the earth is known as gravitational…
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Study Notes for CBSE Class 9 Science Chapter 9 Force and Laws of Motion
Last modified on:5 years agoReading Time:20MinutesStudy Notes for CBSE Class 9 Science Chapter 9 Force and Laws of Motion Forces and Laws of Motion : Force : It is the force that enables us to do any work. To do anything, either we pull or push the object. Therefore, pull or push is called force. Example,…
