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 10 Science Chapter 1 Chemical Reactions and Equations
Last modified on:5 years agoReading Time:15MinutesExtra Questions On Class 10 Science Chemical Reactions and Equations Q.1. In electrolysis of water, why is the volume of gas collected over one electrode double that of gas collected over the other electrode? Answer Answer: It is because water contains hydrogen and oxygen in the ratio of 2 : 1.…
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Extra Questions For Class 9 Science Chapter 5 fundamental unit of life
Last modified on:3 years agoReading Time:17MinutesExtra Questions For Class 9 Science Chapter 5 Fundamental Unit of Life Very Short Answer Type Questions (One Mark Each) Q.1. Name the scientist who discovered cell. Answer Ans. Robert Hooke discovered cell in 1665. Q.2. Who discovered nucleus ? Answer Ans. Robert Brown discovered nucleus. Q.3. Who coined the term…
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Extra Questions For Class 9 Science Chapter 2 Is Matter Around Us Pure
Last modified on:5 years agoReading Time:12MinutesExtra Questions For Class 9 Science Chapter 2 Is Matter Around Us Pure Very Short Answer Type Questions (One Mark Each) Q.1. Suggest separation techniques one would need to employ to separate the mixtures :(a) Mercury and water(b) Potassium Chloride and ammonium chloride. Answer Ans. (a) Using separating funnel. (b) Using…
