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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Extra Questions for Class 9 Science Chapter 13 Why Do We Fall Ill
Last modified on:4 years agoReading Time:6MinutesExtra Questions for Class 9 Science Chapter 13 Why Do We Fall Ill Here we are providing extra questions for class 9 science chapter 13 Why Do We Fall Ill. Various type of questions are provided. These includes very short answer type questions, short answer type questions and long answer type…
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Extra Questions for Class 9 Science Chapter 11 Work and Energy
Last modified on:4 years agoReading Time:17MinutesExtra Questions for Class 9 Science Chapter 11 Work and Energy Here we are providing extra questions for class 9 science chapter 11 work and energy. Various type of questions are provided. These includes very short answer type questions, short answer type questions and long answer type questions as well. These…
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Numerical Problems Based on Class 9 Science Chapter 11 Work and Energy
Last modified on:4 years agoReading Time:6MinutesQ.1. A man weighing 70 kg carries a weight of 10 kg on the top of a tower 100 m high. Calculate the work done by the man (g = 10m/s2). Q.2. A porter lifts a luggage of 15 kg from the ground and puts it on his head 1.5 m…
