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 Definition of Electric Current for Class 12 Physics
Last modified on:4 months agoReading Time:14MinutesElectric Current The physics of charges at rest is called electrostatics or static electricity. We shall now study the motion or dynamics of charges. As the term current implies some sort of motion, so the motion of electric charges constitutes an electric current. Understanding Electric current If two bodies charged to…
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Capacitance – Concept Booster | Class 12 Physics CBSE
Last modified on:4 months agoReading Time:22Minutes 📖 How to Use This Page Read each concept carefully, then check the formula, common mistake, and exam tip before moving to the next. This page covers Capacitance completely for CBSE Class 12 Physics. Key Concepts Class 12 · Physics · Electrostatic Potential and Capacitance 💡 Capacitance Core concepts you…
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Electric Charges and Fields – Concept Booster | Class 12 Physics CBSE
Last modified on:4 months agoReading Time:16Minutes 📖 How to Use This Page Read each concept carefully, then check the formula, common mistake, and exam tip before moving to the next. This page covers Electric Charges and Fields completely for CBSE Class 12 Physics. Key Concepts Class 12 · Physics · Electric Charges and Fields 💡 Electric…
