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:5 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:5 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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Class 11 Chemistry Ch-8 Redox Reactions (VSQ)
Last modified on:5 years agoReading Time:9MinutesQ.1. Identify the oxidizing agent and the reducing agent in the following reaction H2S + HNO3 → NO + S + H2O Answer Answer: In the reaction HNO3 is an oxidizing agent since it itself gets reduced from +5 to +2. While H2S is an reducing agent since it itself gets…
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Class 11 Chemistry Ch-9 Hydrogen (VSQ)
Last modified on:5 years agoReading Time:10MinutesQ.1. Why is 2-ethylanthraquinone preferred in the commercial production of H2O2? Answer Answer: It gets regenerated during the reaction by hydrogenation of 2–ethylanthrahydroquinone. Q.2. Which would have higher electrical conductivity H2O or D2O? Answer Answer: Water due its greater degree of dissociation (pKH2O = 13.997 pKD2O = 14.869) . Q.3. Give…
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Class 11 Chemistry Ch-10 The s-Block Elements (VSQ)
Last modified on:5 years agoReading Time:10MinutesQ.1. Why does a piece of burning magnesium ribbon continues to burn in sulphur dioxide ? Answer Answer: This is because magnesium has high affinity to combine with oxygen of SO2 to form MgO and S. 2Mg + SO2 → 2MgO + S Q.2. What is the function of adding gypsum…
