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 10 Science Chapter 7 Control and Coordination
Last modified on:3 years agoReading Time:5MinutesCase Study Questions for Class 10 Science Chapter 7 Control and Coordination Question 1: Read the case/passage and answer the questions given below. To carry out a simple function such as eating food there has to be coordination of the eyes, hands and the mouth. The eyes have to focus on…
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MCQ Questions for Class 12 Biology Chapter 7 Evolution
Last modified on:4 years agoReading Time:12MinutesMCQ Questions for Class 12 Biology Chapter 7 Evolution Q.1. According to Hugo de Vries, speciation is due to(a) accumulation of small variations (b) intraspecific breeding(c) inter specific breeding (d) saltation Answer Answer: (d) Q.2. The most accepted line of descent in human evolution is (a) Australopithecus → Ramapithecus → Homo…
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MCQ Questions for Class 12 Biology Chapter 6 Molecular Basis of Inheritance
Last modified on:4 years agoReading Time:14MinutesMCQ Questions for Class 12 Biology Chapter 6 Molecular Basis of Inheritance Q.1. Gene controls(a) protein synthesis but not heredity(b) protein synthesis and heredity(c) heredity but not protein synthesis(d) biochemical reaction of some enzymes Answer Answer: (b) Q.2. With regard to mature mRNA in eukaryotes(a) exons and introns do not appear…
