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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NCERT Exemplar for Class 7 Science Chapter 14 Electric Current and Its Effects
Last modified on:3 years agoReading Time:6MinutesNCERT Exemplar for Class 7 Science Chapter 14 Electric Current and Its Effects NCERT Exemplar Books for Class 7 NCERT (National Council of Educational Research and Training) Exemplar Books are supplementary study materials that are designed to provide additional practice and challenge for students in addition to the concepts covered in…
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NCERT Exemplar for Class 7 Science Chapter 3 Fibre to Fabric
Last modified on:3 years agoReading Time:6MinutesNCERT Exemplar for Class 7 Science Chapter 3 Fibre to Fabric NCERT Exemplar Books for Class 7 NCERT (National Council of Educational Research and Training) Exemplar Books are supplementary study materials that are designed to provide additional practice and challenge for students in addition to the concepts covered in the NCERT…
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NCERT Exemplar for Class 7 Science Chapter 17 Forests – Our Lifeline
Last modified on:3 years agoReading Time:6MinutesNCERT Exemplar for Class 7 Science Chapter 17 Forests – Our Lifeline NCERT Exemplar Books for Class 7 NCERT (National Council of Educational Research and Training) Exemplar Books are supplementary study materials that are designed to provide additional practice and challenge for students in addition to the concepts covered in the…
