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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Important Questions Class 12 Chemistry Chapter 6 General Principles and Processes of Isolation of Elements 1 Mark Questions
Last modified on:5 years agoReading Time:6Minutes1. What is pig iron? Ans. The iron which is obtained from blast furnace and contains about 4% carbon and many other impurities in smaller amounts like S, P, Si, Mn etc, is called pig iron. 2. What is cast iron? Ans. Iron obtained by melting pig iron with scrap iron and coke…
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Important Questions CBSE Class 10 Science Life Processes 1 Mark Questions
Last modified on:5 years agoReading Time:10Minutes1. Amoeba shows following kind of nutrition(a) autotrophic(b) holozoic(c) saprotrophic(d) parasitic Answer (b)Holozoic 2. The process by which blood is cleared of metabolic wastes in case of kidney failure is called(a) artificial kidney(b) dialysis(c) transplantation(d) filtration Answer (b)Dialysis 3. Woody plants carry gaseous exchange through(a) root hair(b) stem hair(c) Lenticels(d) epidermal…
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Important Questions Class 12 Chemistry Chapter 5 Surface Chemistry 1 Mark Questions
Last modified on:5 years agoReading Time:9Minutes1. What do you mean by the term –Adsorption ? Ans. The accumulation of molecular species at the surface rather than in bulk of a solid liquid is termed as Adsorption. 2. Explain the terms – Adsorbate and Adsorbent with examples Ans. The molecular species which get concentrated or accumulated at the…
