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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Class 12 Chemistry Ch-Surface Chemistry (MCQ)
Last modified on:5 years agoReading Time:15Minutes1. Which of the following process does not occur at the interface of phases?(i) crystallisation(ii) heterogenous catalysis(iii) homogeneous catalysis(iv) corrosion Answer Answer: (iii) homogeneous catalysis Explanation: In homogeneous catalysis, only, the reactant and product are in same phase and composition is uniform throughout. 2. At the equilibrium position in the process…
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Chemistry MCQs for Class 12 with Answers Chapter 14 Biomolecules
Last modified on:5 years agoReading Time:17MinutesMCQs Based On Class 12 Chemistry Chapter 14 Biomolecules MCQ Questions for Class 12 Chemistry are prepared by the subjects experts according to the latest pattern. These MCQs are very important for students who wants to score well in CBSE Board Exam. These MCQs on chapter 14 Biomolecules will also help…
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Physics MCQs for Class 12 with Answers Chapter 10 Wave Optics
Last modified on:5 years agoReading Time:31MinutesQ.1. The locus of all particles in a medium, vibrating in the same phase is called(a) wavelet(b) fringe(c) wave front(d) None of these Answer Answer: (c) Q.2. Which of the following is correct for light diverging from a point source?(a) The intensity decreases in proportion for the distance squared.(b) The wavefront…
