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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Conductors and Insulators
Last modified on:4 years agoReading Time:2MinutesConductors and Insulators Solids are mainly classified into two groups, conductors and insulators. In conductors, electric charges are free to move from one place to another, whereas in insulators they are tightly bound to their respective atoms. In an uncharged body, there are equal number of positive and negative charges. The…
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Electric Field Due to a Point Charge
Last modified on:3 years agoReading Time:1MinuteElectric Field Due to a Point Charge The electric field produced by a point charge q can be obtained in general terms from Coulomb’s law.First note that the magnitude of the force exerted by the charge q on a test charge q0 is then divide this value by q0 to obtain…
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Electric Field Due to a Charged Ring
Last modified on:3 years agoReading Time:4MinutesElectric Field Due to a Charged Ring A conducting ring of radius R has a total charge q uniformly distributed over its circumference. We are interested in finding the electric field at point P that lies on the axis of the ring at a distance x from its centre. We divide…
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Class 9 Science Atoms & Molecules
Last modified on:5 years agoReading Time:4MinutesImportant Notes Law of conservation of mass : Mass can neither be created nor can it be destroyed in a chemical reaction. Law of constant proportions : In a pure substance same elements are always present in a definite proportion by weight. Atom : Smallest unit of an element, which may…
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CBSE Class 9 Science Important Question Chapter 9 Force and Laws of Motion
Last modified on:5 years agoReading Time:12Minutes Very Short Answer Questions (1 Marks) Part-1 Q.1. State Newton’s first law of motion. Q.2. An athelete always runs some distance before taking a jump. Why? Q.3. Define 1 kg weight and express it in newton. Q.4. What is the mass of an object whose weight is 196 N? Q.5. Two similar…
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CBSE Class 9 Science Revision Notes Chapter 9 Force and Laws of Motion
Last modified on:5 years agoReading Time:8Minutes1. Force, generally denotes push or pull. 2. Force, is defined as an external agent which changes or tends to change the state of rest or uniform motion of the body or changes the direction of the body or deforms the body. 3. Effects of force :(i) A force can produce…
