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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Problems Based on Work and Energy for Class 9 Science
Last modified on:3 years agoReading Time:9MinutesIn physics, work done is defined as the product of force applied to an object and its displacement. Work is a scalar quantity and is typically measured in the unit of Joules (J). The formula for calculating work is: W = F x d where W is the work done, F…
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MCQ Questions Based on Momentum Conservation Principle for Class 9 Science
Last modified on:3 years agoReading Time:9MinutesHere we are providing MCQ Questions Based on Momentum Conservation Principle for Class 9 Science. Students can practice these Topicwise MCQ Questions to understand the topic well. Answers are also provided so that student can check their answer after completing these questions. The principle of momentum conservation states that the total…
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MCQ Questions Based on Newton’s First Law of Motion
Last modified on:3 years agoReading Time:7MinutesHere we are providing MCQ Questions Based on Newton’s First Law of Motion. Answers are also provided so that student can check their answer after completing these questions. MCQ Questions Based on Newton’s First Law of Motion Q.1. What is the first law of motion?A. A body at rest stays at…
