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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Units and Measurements – Concept Booster | Class 11 Physics CBSE
Last modified on:4 months agoReading Time:19Minutes 📖 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 Units and Measurement completely for CBSE Class 11 Physics. Key Concepts Class 11 · Physics · Units and Measurement 💡 Units & Measurement…
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Electric Charges and Fields – Mistake Buster | Class 12 Physics CBSE
Last modified on:4 months agoReading Time:11Minutes ⚠ Mistake Buster — How to Use This page lists the 5 most common mistakes students make in Electric Charges and Fields. For each mistake: read what goes wrong → understand why → memorise the correct approach. Check this page the night before your exam. 5 Mistakes Covered 8–12 Marks…
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Electric Charges and Fields – Formula Flashcards | Class 12 Physics CBSE
Last modified on:4 months agoReading Time:13Minutes ⚡ Formula Flashcard — How to Use Every formula for Electric Charges and Fields is below with its meaning, SI unit, notation, and exam note. Revise all 12 formulas in under 5 minutes. Bookmark for last-night board exam revision. All Formulas Class 12 · Physics · Chapter 1 · Electric…
