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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Case Study Questions for Class 9 Science Chapter 14 Natural Resources
Last modified on:4 years agoReading Time:4MinutesCase Study/Passage Based Questions: Question 1: At present the primary nutrient which limits the agricultural yield is nitrogen (N). Some plants are capable to produce more N2 than they consume. These plants show symbiotic relationship with N2-fixing bacteria such as Rhizobium.These bacteria produce root nodules in leguminous plants and convert atmospheric…
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Case Study Questions for Class 9 Science Chapter 12 Sound
Last modified on:2 years agoReading Time:7Minutes Board CBSE Useful for Class 9 Students Subject Science Chapter Chapter 12 Sound Question Type Case Study Questions No. of Questions 1 With Answers Yes Important Link Class 9 Chapterwise Case Study Case Study Questions for Class 9 Science Chapter 12 Sound Here we are providing case study questions for…
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MCQ Questions for Class 10 Science Chapter 14 Sources of Energy
Last modified on:4 years agoReading Time:7MinutesMCQ Questions for Class 10 Science Chapter 14 Sources of Energy Q.1. Which of the following is the renewable source of energy?(A) natural gas (B) petroleum (C) coal (D) wind Show Answer Answer: (D) Q.2. The energy liberated by charcoal on burning is(A) 30 kJ (B) 33 kJ (C) 35 kJ…
