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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Physics VSQs for Class 11 with Answers Chapter 3 Motion in a Straight Line
Last modified on:5 years agoReading Time:9MinutesQ.1. Are rest and motion absolute or relative terms? Answer Answer: Yes, both rest and motion are relative terms. An object at rest in one frame of reference can be in motion in another frame of reference. Q.2. Can an object be at rest as well as in motion at the…
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Conservation of Energy and Momentum MCQs for NEET
Last modified on:5 years agoReading Time:8MinutesQ1. If the kinetic energy of a body increases by 0.1%, the percentage increase in its momentum will be (a) 0.05% (b) 0.1% (c) 1.0% (d) 10% Answer: (a) Q.2. Work done in raising a box depends on(a) How fast it is raised(b) The strength of the man(c) The height by…
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Conservation of Linear Momentum and Impulse MCQs for NEET
Last modified on:5 years agoReading Time:10MinutesQ.1. An explosion breaks a rock into three parts in a horizontal plane. Two of them go off at right angles to each other. The first part of mass 1 kg moves with a speed of 12 m/s and the second part of mass 2 kg moves with 8 m/s speed.…
