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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Reynolds Number
Last modified on:3 years agoReading Time:10MinutesWhat is Reynolds Number? The Reynolds number (Re) is a dimensionless parameter used in fluid mechanics to characterize the flow of a fluid (liquid or gas) around an object or through a conduit. It relates the inertial forces to the viscous forces in the fluid and helps determine the type of…
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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…
