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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Numerical Problems Based on Capacitance of Spherical Conductors for Class 12 Physics
Last modified on:3 years agoReading Time:7MinutesNumerical Problems Based on Capacitance of Spherical Conductors for Class 12 Physics Q.1. Eight identical spherical drops, each carrying a charge 1 nC are at a potential of 900 V each. All these drops combine together to form a single large drop. Calculate the potential of this large drop. (Assume no…
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Numerical Problems Based on Electric Potential Energy for Class 12 Physics
Last modified on:3 years agoReading Time:9MinutesNumerical Problems Based on Electric Potential Energy for Class 12 Physics Q.1. Find the amount of work done in arranging the three point charges, on the vertices of an equilateral triangle ABC, of side 10 cm, as shown in the adjacent figure. (Ans. – 3.24 J) Q.2. Two point charges +10μC…
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Numerical Problems Based on Relation between Electric Field and Potential for Class 12 Physics
Last modified on:3 years agoReading Time:8MinutesRelation between Electric Field and Potential (1) Electric field in a region can be determined from the electric potential by using relation, (2) Electric field between two parallel conductors, E = V/d (3) Electric potential in a region can be determined from the electric field by using the relation, Numerical Problems…
