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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Tips to Drive Out Exam Phobia
Last modified on:5 years agoReading Time:8Minutes10 Tips to Drive Out Exam Phobia If you are one of the many people who gets stressed out when it comes to taking exams then we have a few tips for you that will help you to overcome this and concentrating on achieving good grades. FOR CBSE FREE NOTES/ ASSIGNMENTS/…
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CBSE 10 Science Ch-13 Magnetic Effects of Electric Current (Solved assignment)
Last modified on:5 years agoReading Time:9MinutesChapter – 13 Magnetic Effects Of Electric Current (One Mark Question) Q.1 Why does the bulk of iron fillings stick to the ends of a bar magnet and not at its centre? Ans. Because at the ends magnetic strength is maximum and at centres magnetic strength is least. Q.2 If the…
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NEET Physics Units, Dimensions and Measurement Notes
Last modified on:5 years agoReading Time:19Minutes1. Topics to be covered in this lesson 1.1 Units1.2 Dimensions1.3 Dimensional analysis and applications1.4 Limitations of Dimensional method1.5 Accuracy and Precision1.6 Significant figures1.7 Errors in measurement1.8 Measuring Instruments SOLVED EXAMPLES 1.1 UNITS Measurement of any physical quantity involves its comparison with a certain basic, reference standard called unit. Any standard unit must have two properties(a) Invariability(b) AvailabilityThe result of…
