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 MCQ for Class 12 Chapter 4 Moving Charges and Magnetism
Last modified on:5 years agoReading Time:32MinutesCheck out the latest MCQ Questions on CBSE Class 12 Physics Chapter 4 Moving Charges and Magnetism. These questions are extremely helpful for CBSE Board Exams. NCERT Exemplar questions are also included. These concepts are not only important for the CBSE board exam but also are crucial for the competitive exams…
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Physics MCQs for Class 12 with Answers Chapter 6 Electromagnetic Induction
Last modified on:5 years agoReading Time:28MinutesMCQs based on Electromagnetic Induction: Q.1. Whenever the magnetic flux linked with an electric circuit changes, an emf is induced in the circuit. This is called(a) electromagnetic induction(b) lenz’s law(c) hysteresis loss(d) kirchhoff’s laws Answer Answer: (a) Q.2. In electromagnetic induction, the induced charge is independent of(a) change of flux(b) time.(c)…
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NCERT Class 12 Physics Solutions
Last modified on:5 years agoReading Time:3MinutesAll the schools have NCERT books into their curriculum and no other book is recommended. The first preference for any exam is NCERT books be it your board exams, medical entrance exams or the most prestigious UPSC exams. We have tried to provide the most suitable and relevant solution to the…
