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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Extra Questions For Class 12 Chapter 1 Electric Charges and Fields
Last modified on:4 years agoReading Time:31MinutesExtra Questions For Class 12 Physics Chapter 1 Electric Charges and Fields We are providing chapter-wise extra questions for class 12 physics. Students can practice these questions to score better marks in their exam. Very Short Answer Questions: Q.1. Give two points of distinction between charge and mass.Ans. Charge can be…
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Extra Questions For Class 10 Science Chapter 10 Reflection and Refraction of Light
Last modified on:5 years agoReading Time:17MinutesExtra Questions On Reflection and Refraction of Light Reflection is the bouncing back of light when it strikes on a polished surface like mirror. Laws of Reflection: (1) Angle of incidence is equal to the angle of reflection.(2) The incident ray, the reflected ray and the normal at the point of…
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Study Notes for Class 9 Science Chapter 8 Motion
Last modified on:5 years agoReading Time:18MinutesStudy Notes for Class 9 Science Chapter 8 Motion Topics to be covered: What is motion? Describing motion of a particle Position, path length and displacement Speed and Velocity Rate of change of velocity Distance-time graph Velocity-time graph Equations of Motion Uniform Circular Motion What is motion? State of Rest: An…
