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 9 Maths Chapter 2 Polynomials
Last modified on:3 years agoReading Time:3MinutesCase Study Questions Question 1: On one day, principal of a particular school visited the classroom. Class teacher was teaching the concept of polynomial to students. He was very much impressed by her way of teaching. To check, whether the students also understand the concept taught by her or not, he…
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Extra Questions for Class 10 Science Chapter 11 Human Eye and Colourful World
Last modified on:4 years agoReading Time:11MinutesQ.1. The sky appears dark instead of blue to an astronaut. State its reason. Answer. The sky appears dark to the astronaut as scattering does not take place at very high altitude due to the absence of atmosphere. Q.2. Which phenomenon is responsible for making the path of light visible? Answer.…
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Extra Questions for Class 10 Science Chapter 9 Heredity and Evolution
Last modified on:4 years agoReading Time:13MinutesQ.1. Name the plant Mendel selected for his experiments on genetics.Answer: The plant selected by Mendel for his experiments on Genetics was Pisum sativum. The common name for this plant is sweet pea. Q.2. State the unit of hereditary material found in all living organisms.Answer: The unit of hereditary material found…
