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:5 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:5 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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Problems Based on Newton’s Second Law of Motion
Last modified on:4 years agoReading Time:16MinutesNEWTON’S LAWS OF MOTION NEWTON’S SECOND LAW OF MOTION Newton’s second Law of Motion states that The rate of change of momentum is directly proportional to the force applied in the direction of force. For example; when acceleration is applied on a moving vehicle, the momentum of the vehicle increases and…
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Problems Based on Equations of Motion for Class 9 Science
Last modified on:5 months agoReading Time:30Minutes[PDF] Download Problems Based on Equations of Motion for Class 9 Science EQUATIONS OF MOTION When an object moves along a straight line with uniform acceleration, it is possible to relate its velocity, acceleration during motion and the distance covered by it in a certain time interval by a set of…
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Problems Based on Graphical Representation of Motion for Class 9 Science
Last modified on:5 months agoReading Time:22MinutesGraphical Representation of Motion A graph represents the relation between two variable quantities in pictorial form. It is plotted between two variable quantities. The quantity that is varied our choice is called independent variable. The other quantity, which varies as a result of this change, is called dependent variable. For example,…
