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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Class 9 Science MCQs From Chapter 2 Is Matter Around Us Pure
Last modified on:5 years agoReading Time:8MinutesQ.1. What is the name of the metal which exists in liquid state at room temperature?(a) Sodium(b) Potassium(c) Mercury(d) Bromine Answer (c) Mercury Q.2. When the liquid is spun rapidly, the denser particles are forced to the bottom and the lighter particles stay at the top. This principle is used in:(a) Centrifugation(b) Fractional…
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Class 9 Science MCQs From Chapter 1 Matter in Our Surroundings
Last modified on:5 years agoReading Time:13Minutes1. In which of the following conditions, the distance between the molecules of hydrogen gas would increase?(i) Increasing pressure on hydrogen contained in a closed container(ii) Some hydrogen gas leaking out of the container (iii) Increasing the volume of the container of hydrogen gas(iv) Adding more hydrogen gas to the container without…
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Class 9 Science Chapter 6 Tissue Study Notes
Last modified on:5 years agoReading Time:1Minute
