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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Case Study Questions for Class 9 Maths Chapter 13 Surface Area and Volume
Last modified on:4 years agoReading Time:3MinutesCase Study Questions Question 1: Nakul was doing an experiment to find the radius r of a ball. For this he took a cylindrical container with radius R = 7 cm and height 10 cm. He filled the container almost half by water as shown in the figure-1. Now he dropped…
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Case Study Questions for Class 9 Maths Chapter 10 Circles
Last modified on:2 years agoReading Time:3MinutesCase Study Questions for Class 9 Maths Chapter 10 Circles Case Study Questions Question 1: Ankit visited in a mall with his father. He sees that three shops are situated at P, Q, R as shown in the figure from where they have to purchase things according to their need. Distance…
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Case Study Questions for Class 9 Maths Chapter 9 Quadrilaterals
Last modified on:4 years agoReading Time:3MinutesCase Study Questions Question 1: After summervacation, Manit’s class teacher organised a small MCQ quiz, based on the properties of quadrilaterals. During quiz, she asks different questions to students. Some of the questions are listed below. (i) Which of the following is/are the condition(s) for ABCD to be a quadrilateral?(a) The…
