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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NEET DPP Biology Ch-03 Plant Kingdom
Last modified on:5 years agoReading Time:30MinutesQ.1. Floridean starch is found in (a) Chlorophyceae(b) Rhodophyceae (c) Phaeophyceae(d) Cyanophyceae Answer (b) Reserve food in red algae (Rhodophyceae) is floridean starch. In green algae (Chlorophyceae), reserve food is starch. In brown algae Phaeophyceae, reserve food is laminarin and mannitol. In Cyanophyceae, reserve food is cyanophycean starch. Q.2. Peat moss…
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NEET DPP Biology Ch-02 Biological Classification
Last modified on:5 years agoReading Time:30MinutesQ.1. Which of the following processes are involved in the reproduction of protista?(a) Binary fission and fragmentation(b) Cell fusion and zygote formation(c) Spore formation and fragmentation(d) Budding and spore formation Answer (b) Q.2. In prokaryotes, the genetic material is(a) linear DNA with histones(b) circular DNA with histones(c) linear DNA without histones(d)…
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NEET DPP Biology Ch-01 The Living World
Last modified on:5 years agoReading Time:28MinutesQ.1. The living organisms can be unexceptionally distinguished from the non-living things on the basis of their ability for(a) interaction with the environment and progressive evolution(b) reproduction(c) growth and movement(d) responsiveness to touch. Answer (b) There are several factors and processes which differentiate living beings with non-living beings like reproduction, respiration,…
