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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Class 9 Science MCQs From Chapter 2 Is Matter Around Us Pure
Last modified on:5 years agoReading Time:8MinutesQ.1. What is the name of the metal which exists in liquid state at room temperature?(a) Sodium(b) Potassium(c) Mercury(d) Bromine Answer (c) Mercury Q.2. When the liquid is spun rapidly, the denser particles are forced to the bottom and the lighter particles stay at the top. This principle is used in:(a) Centrifugation(b) Fractional…
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Class 9 Science MCQs From Chapter 1 Matter in Our Surroundings
Last modified on:5 years agoReading Time:13Minutes1. In which of the following conditions, the distance between the molecules of hydrogen gas would increase?(i) Increasing pressure on hydrogen contained in a closed container(ii) Some hydrogen gas leaking out of the container (iii) Increasing the volume of the container of hydrogen gas(iv) Adding more hydrogen gas to the container without…
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Class 9 Science Chapter 6 Tissue Study Notes
Last modified on:5 years agoReading Time:1Minute
