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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Human Eye & Colourful World (Numerical with Answer)
Last modified on:5 months agoReading Time:14MinutesHere we are providing numerical assignment on class 10 science chapter human eye and colourful world. Answers are also provided for reference. Numerical Problems Based on Human Eye and Colourful World Q.1. If the concave lens of focal length (f = 1.5m) used to restore the proper vision, then what is…
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CBSE Class 10 Human Eye & Colourful World NCERT Solution
Last modified on:5 years agoReading Time:11Minutes Human Eye & Colourful World (NCERT solution) Q. 1. What is meant by power of accommodation of the eye? Ans. The ability of the eye lens to adjust its focal length is called power of accommodation of the eye. This enables us to see distant objects and nearby object clearly.…
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Questions on Kinematics
Last modified on:5 years agoReading Time:24MinutesQ1. A man travels a distance of 1.5 m towards East, then 2.0 m towards South and finally 4.5 m towards East. i. What is the total distance travelled? ii. What is his resultant displacement? Q2. A scooterist covers a distance of 3 kilometers in 5 minutes. Calculate his speed in…
