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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Heredity & Evolution
Last modified on:5 years agoReading Time:29Minutes Facts that Matter Heredity is the transmission of characters or traits from the parents to their offspring. Variation is the difference in the characters or traits among the individuals of a species. Accumulation of Variations Sexual reproduction of organisms produces variations. The variations produced in organisms during successive generations…
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Important Questions for CBSE 12 Board Examination (Physics)
Last modified on:5 years agoReading Time:3MinutesQ.1) What is the direction of the force acting on a charge particle q, moving with a velocity v in a uniform magnetic field B ? Answer: Q.2) Name the part of the electromagnetic spectrum of wavelength 10- 2 m and mention its one application. Answer: Q.3) An electron and alpha…
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Important Questions for CBSE Board Exams (Chemistry)
Last modified on:5 years agoReading Time:16Minutes This section will be updated regularly. Stay tuned!!! Q.1) Which point defect in crystals does not alter the density of the relevant solid? Answer: Frenkel defect. Q.2) Define the term ‘Tyndall effect’. Answer: The scattering of light by colloidal particles is known as Tyndall effect. Q.3) Why is the froth…
