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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JEE Main Mock Test Series
Last modified on:5 years agoReading Time:6Minutes Online Test Series for JEE Main-2022 Gurukul’s Online Chapter Wise, Topic Wise and Mock Tests for JEE Main is a very effective test and assessment platform where students experience different type of tests with different level of toughness. It helps students to get comfortable with the actual exam. Click on the…
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Conceptual Questions Based On Current Electricity
Last modified on:3 years agoReading Time:25MinutesConceptual Questions Based on Current Electricity Here we are providing conceptual questions for Class 12 Physics Chapter 3 Current Electricity. Students are suggested to go through all the questions to understand the chapter well. Q.1. The standard resistance coils are made up of manganin. Why?Answer: When current flows through a wire…
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Conceptual Questions Based On Electric Potential
Last modified on:5 years agoReading Time:10MinutesQ.1. Why earth is considered to be at zero potential?Answer: Earth has very large size. Potential of earth does not change with small charge therefore it is considered as reference level and potential taken as zero. Q.2. If electric potential V within a certain region is constant, what is the nature…
