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 Questions for Class 11 Physics Chapter 2 Units and Measurements
Last modified on:12 months agoReading Time:6Minutes Case Study Questions for Class 11 Physics Chapter 2 Units and Measurements Case Study Questions Question 1: Measurement of Physical QuantityAll engineering phenomena deal with definite and measured quantities and so depend on the making of the measurement. We must be clear and precise in making these measurements. To make…
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Case Study and Passage Based Questions for Class 12 Biology Chapter 9 Strategies for Enhancement in Food Production
Last modified on:4 years agoReading Time:2MinutesCase Study/Passage Based Questions: Question 1: Given below is a flowchart for the formation of somatic hybrid, Pomato. (i) A certain tissue, of a plant, infected with TMV was used to obtain a new plant using tissueculture technique. Identify the technique used and reason out the possibility of obtaininga new healthy…
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Case Study and Passage Based Questions for Class 12 Biology Chapter 7 Evolution
Last modified on:4 years agoReading Time:2MinutesCase Study/Passage Based Questions: Question 1: Darwin found the varieties of finches that in travelled to Galapagos Islands and observed variations in them. (i) What role does an individual organism play as per Darwin’s theory of natural selection?(ii) How did Darwin explain the existence of different varieties of finches on Galapagos…
