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 10 Chemistry Periodic Classification of Elements
Last modified on:5 years agoReading Time:16MinutesImportant Notes Early chemists classified elements as metals and non-metals on the basis of a set of physical and chemical properties. Dobereiner classified elements on the basis of “Law of Triads” which states that “atomic mass of the middle element of a triad is almost the arithmetic mean of the other…
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Class 10 Science Acids, Bases & Salt Important Questions
Last modified on:5 years agoReading Time:22MinutesVery Short Answer Questions Blue and red litmus papers are placed simultaneously in a colourless aqueous solution. It is found that the colour of both litmus papers is red. What is the nature of the solution and why? A strip of absolutely clear cloth is sprayed with onion juice. The strip…
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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…
