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.
-
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…
-
Numerical Problems Based on Ohms law, Resistivity, Conductivity, Current Density and Colour Code of Carbon Resistors for Class 12 Physics
Last modified on:4 weeks agoReading Time:17Minutes Numerical Problems on Current Electricity Class 12 Physics · Current Electricity SQ Ohm’s Law, Resistance & Resistivity Practice Set Apply $V = IR$, $R = \rho L/A$, Current Density and Carbon Resistor Colour Codes Ch 3 · Current Electricity 1 A voltage of 30 V is applied across a colour…
-
Case Study Questions for Class 9 Science Chapter 13 Earth as a System (Exploration Book) 2026-27
Last modified on:3 months agoReading Time:16Minutes This page provides Case Study Questions for Class 9 Science Chapter 13 – Earth as a System from the latest NCERT Exploration textbook. Each set contains a reading passage followed by 4 objective/short-answer questions, exactly as expected in the CBSE Board examination pattern. 💡 Exam Tip: Case Study questions carry 4…
-
Case Study Questions for Class 9 Science Chapter 12 Patterns in Life (Exploration Book) 2026-27
Last modified on:3 months agoReading Time:16Minutes This page provides Case Study Questions for Class 9 Science Chapter 12 – Patterns in Life from the latest NCERT Exploration textbook. Each set contains a reading passage followed by 4 objective/short-answer questions, exactly as expected in the CBSE Board examination pattern. 💡 Exam Tip: Case Study questions carry 4 marks…
