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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Conceptual Questions Based on Class 12 Physics Electromagnetic Waves
Last modified on:4 years agoReading Time:7MinutesHere we are providing conceptual questions based on class 12 physics chapter 8 electromagnetic waves. These questions are prepared by experts and are very useful from exam point of view. Students can practice these questions for scoring better marks in the exam. Conceptual Questions Based on Class 12 Physics Electromagnetic Waves…
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Conceptual Questions Based on Class 12 Physics Magnetism and Matter
Last modified on:4 years agoReading Time:7MinutesConceptual Questions Based on Class 12 Physics Magnetism and Matter Q.1. Does a magnetic monopole exist? Justify your answer. How magnetic field is produced? Solution. No, a magnetic monopole does not exist. The reason is that a magnetic field is produced by a current loop and not by monopole of a…
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Conceptual Questions Based on Class 12 Physics Alternating Current
Last modified on:4 years agoReading Time:11MinutesConceptual Questions Based on Alternating Current Q.1. Why a d.c. voltmeter and d.c. ammeter cannot read a.c.? Solution. The average value of a.c. over a cycle is zero. So, a d.c. voltmeter/ammeter will show zero reading with alternating voltage/current. Q.2. What is meant by the statement that the current through an…
