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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Charging of Insulators
Last modified on:4 years agoReading Time:2Minutes 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…
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Charging by Contact
Last modified on:4 years agoReading Time:2Minutes Charging by Contact When a negatively charged ebonite rod is rubbed on a metal object, such as a sphere, some of the excess electrons from the rod are transferred to the sphere. Once the electrons are on the metal sphere, where they can move readily, they repel one another and…
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Charging by Rubbing
Last modified on:4 years agoReading Time:3Minutes Charging by Rubbing The simplest way to charge certain bodies is to rub them against each other. When a glass rod is rubbed with a silk cloth, the glass rod acquires some positive charge and the silk cloth acquires negative charge by the same amount. The explanation of appearance of…
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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…
