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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Physics MCQs for Class 12 with Answers Semiconductor Electronics
Last modified on:5 years agoReading Time:31MinutesQ.1. In a semiconductor(a) there are no free electrons at 0 K(b) there are no free electrons at any temperature(c) the number of free electrons increases with pressure(d) the number of free electrons is more than that in a conductor Answer Answer: (a) Q.2. Let nh and ne be the number…
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Electric Charges and Fields Class 12 Physics MCQ Questions
Last modified on:2 years agoReading Time:38MinutesHere we are providing mcq questions for class 12 physics chapter 1 electric charges and fields. Students are suggested to go through each and every question to perform better in exams. Chapter Electric Charges and Fields Type of Questions MCQ Nature of Questions Competency Based Questions Board CBSE Class 12 Subject…
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Class 11 Chemistry Ch-8 Redox Reactions (VSQ)
Last modified on:5 years agoReading Time:9MinutesQ.1. Identify the oxidizing agent and the reducing agent in the following reaction H2S + HNO3 → NO + S + H2O Answer Answer: In the reaction HNO3 is an oxidizing agent since it itself gets reduced from +5 to +2. While H2S is an reducing agent since it itself gets…
