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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Quick Revision Notes for Class 10 Science Chapter 6 Life Processes
Last modified on:3 years agoReading Time:31MinutesQuick Revision Notes for Class 10 Science Chapter 6 Life Processes Quick revision notes are a summarized form of study material that condenses the most important information from a larger body of text. They are designed to help students review and retain key concepts, facts, and ideas in a short amount…
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Class 10 Physics Light Important Questions
Last modified on:5 years agoReading Time:15MinutesVery Short Answer Questions [1 marks] 1. Define lens.Ans. A piece of optical material bounded by one or two spherical surfaces is called lens. 2. Why is a convex lens called converging lens? Ans. It is because a parallel beam of light on passing through it converges at a point. 3. Define…
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Class 10 Physics Light (NCERT Solution)
Last modified on:5 years agoReading Time:8MinutesNCERT QUESTIONS WITH THEIR ANSWERS IN-TEXT QUESTIONS Page 168 1. Define the principal focus of a concave mirror. Ans. A point in front of a concave mirror, on its principal axis, such that parallel rays travelling parallel to the principal axis, after reflection actually converge at this point. 2. The radius…
