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:5 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:5 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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Physics MCQs for Class 12 with Answers Chapter 5 Magnetism and Matter
Last modified on:5 years agoReading Time:11MinutesQ.1. Ferrites may be:(a) ant. ferromagnetic(b) ferromagnetic(c) ferrimagnetic(d) None of the above Answer (b) ferromagnetic Q.2. The magnetic lines of force inside a bar magnet:(a) do not exist(b) depends on area of cross-section of bar magnet(c) are from N-pole to S-pole of the magnet(d) are from S-pole to N-pole of the…
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Assertion and Reason Questions on Class 12 Chemistry Chapter 16 CHEMISTRY IN EVERYDAY LIFE
Last modified on:1 year agoReading Time:4MinutesAssertion and Reason Questions on Class 12 Chemistry Chapter 16 Chemistry in Everyday Life Directions: These questions consist of two statements, each printed as Assertion and Reason. While answering these questions, you are required to choose any one of the following four responses.(a) If both Assertion and Reason are correct and the…
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Assertion and Reason Questions on Class 12 Chemistry Chapter 15 Polymers
Last modified on:1 year agoReading Time:8MinutesAssertion and Reason Questions on Class 12 Chemistry Chapter 15 Polymers Directions: These questions consist of two statements, each printed as Assertion and Reason. While answering these questions, you are required to choose any one of the following four responses.(a) If both Assertion and Reason are correct and the Reason is a…
