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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Extra Questions for Class 9 Science Chapter 13 Why Do We Fall Ill
Last modified on:4 years agoReading Time:6MinutesExtra Questions for Class 9 Science Chapter 13 Why Do We Fall Ill Here we are providing extra questions for class 9 science chapter 13 Why Do We Fall Ill. Various type of questions are provided. These includes very short answer type questions, short answer type questions and long answer type…
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Extra Questions for Class 9 Science Chapter 11 Work and Energy
Last modified on:4 years agoReading Time:17MinutesExtra Questions for Class 9 Science Chapter 11 Work and Energy Here we are providing extra questions for class 9 science chapter 11 work and energy. Various type of questions are provided. These includes very short answer type questions, short answer type questions and long answer type questions as well. These…
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Numerical Problems Based on Class 9 Science Chapter 11 Work and Energy
Last modified on:4 years agoReading Time:6MinutesQ.1. A man weighing 70 kg carries a weight of 10 kg on the top of a tower 100 m high. Calculate the work done by the man (g = 10m/s2). Q.2. A porter lifts a luggage of 15 kg from the ground and puts it on his head 1.5 m…
