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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Extra Questions for Class 12 Biology Chapter 11 Biotechnology Principles and Processes
Last modified on:4 years agoReading Time:9MinutesExtra Questions for Class 12 Biology Chapter 11 Biotechnology Principles and Processes Q.1. Mention the uses of cloning vector in biotechnology. Ans. Cloning vectors are used for transferring fragments of foreign DNA into a suitable host. They are also used to select recombinants from non-recombinants. Q.2. Identify the reason for selection…
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Extra Questions for Class 12 Biology Chapter 10 Microbes in Human Welfare
Last modified on:4 years agoReading Time:6MinutesExtra Questions for Class 12 Biology Chapter 10 Microbes in Human Welfare Q.1. Name the pests that ladybird, beetle and dragonflies help to get rid of.Ans. Ladybird, beetle and dragonflies control aphids and mosquitoes respectively. Q.2. Why is distillation required for producing certain alcoholic drinks?Ans. Distillation increases the alcohol content in…
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Extra Questions for Class 12 Biology Chapter 9 Strategies for Enhancement in Food Production
Last modified on:4 years agoReading Time:6MinutesExtra Questions for Class 12 Biology Chapter 9 Strategies for Enhancement in Food Production Q.1. A herd of cattle is showing reduced fertility and productivity. Provide one reason and one suggestion to overcome this problem. Ans. Inbreeding depression or continuous inbreeding may be the reason of reduced fertility and productivity. To…
