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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Sound (VSA)
Last modified on:5 years agoReading Time:6MinutesVery Short Answer Type Questions (1 Mark) 1. What is reverberation? [2011 (T-II)] 2. Name the disease that can be caused by UV rays. [2011 (T-II)] 3. If 20 waves are produced per second, what is the frequency in hertz? [2011 (T-II)] OTHER IMPORTANT QUESTIONS 1. What do you understand by…
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Important Short Notes (Sound)
Last modified on:5 years agoReading Time:7MinutesSound Important Notes 1. Sound is a mechanical energy which produces sensation of hearing. 2. For hearing sound there must be…
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Important Short Notes
Last modified on:5 years agoReading Time:8MinutesWork & Energy Important Notes 1. Work: Work is said to be done, when a force causes displacement in its own direction. 2. No work is done, if the displacement is…
