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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MCQs (Management of Natural Resources)
Last modified on:5 years agoReading Time:12MinutesQ1. Which of the following is a green house gas? (a) Nitrogen dioxide (b) Sulphur dioxide (c) Carbon dioxide (d) Carbon monoxide Q2. Floods can be prevented by (a) afforestation …
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TEST YOUR SKILLS (Management of Natural Resources)
Last modified on:5 years agoReading Time:3Minutes Q1. The forest is located in a place where villages and tribals are dependent on it. Industrialist is the stakeholder of the forest who is cutting down the trees for profits. What could be the harmful effect of this on forest, local people and environment. Q2. People of locality A…
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Management of Natural Resources (NCERT Questions Solved)
Last modified on:5 years agoReading Time:16Minutes Q1. What changes can you make in your habits to become more environment-friendly? Ans. (i) Do not throw garbage on the road side. (ii) Switch off lights, fans, TV when not required. (iii) Use less water for bathing, washing jobs. …
