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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Case Study Questions for Class 9 Maths Chapter 1 Real Numbers
Last modified on:3 years agoReading Time:3MinutesCase Study Questions for Class 9 Maths Chapter 1 Real Numbers Case Study Questions: Question 1: Himanshu has made a project on real numbers, where he finely explained the applicability of exponential laws and divisibility conditions on real numbers. He also included some assessment questions at the end of his project…
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Case Study and Passage Based Questions for Class 10 Maths Chapter 15 Probability
Last modified on:3 years agoReading Time:3MinutesCase Study and Passage Based Questions for Class 10 Maths Chapter 15 Probability Case Study Questions: Question 1: On a weekend Rani was playing cards with her family. The deck has 52 cards. If her brother drew one card. (i) Find the probability of getting a king of red colour.(a) 1/26(b)…
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Case Study and Passage Based Questions for Class 10 Maths Chapter 8 Introduction to Trigonometry
Last modified on:3 years agoReading Time:3MinutesCase Study and Passage Based Questions for Class 10 Maths Chapter 8 Introduction to Trigonometry Case Study Questions: Question 1: Ananya is feeling so hungry and so thought to eat something. She looked into the fridge and found a bread pieces. She decided to make a sandwich. She cut the piece…
