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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Case Study and Passage Based Questions for Class 12 Biology Chapter 1 Reproduction in Organisms
Last modified on:4 years agoReading Time:3MinutesCase Study/Passage Based Questions: Question 1: Given below is the diagram of a ginger rhizome. Answer the questions given below based onthe diagram. (i) Why do vegetative propagules in sugarcane and ginger appear from the nodes?(ii) Name the vegetative propagules in (a) Potato, and (b) Pistia.(iii) How does potato multiply? Answer…
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Case Study and Passage Based Questions for Class 9 Science Chapter 9 Force and Laws of Motion
Last modified on:2 years agoReading Time:6MinutesCase Study/Passage Based Questions: Question 1: Read the following and answer any four questions from (i) to (v) given below : In the figure below the card is flicked with a push. It was observed that the card moves ahead while coin falls in glass. (i) Give reason for the above…
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Case Study and Passage Based Questions for Class 9 Science Chapter 8 Motion
Last modified on:2 years agoReading Time:3MinutesCase Study/Passage Based Questions: Question 1: Read the following paragraph and any four questions from (i) to (v). Distance is the length of the actual path covered by an object, irrespective of its direction of motion. Displacement is the shortest distance between the initial and final positions of an object in…
