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…
-
MCQ based on Kepler’s Law
Last modified on:4 years agoReading Time:9MinutesOne of the greatest ideas proposed in human history is the fact that the earth is a planet, among the other planets, that orbits the sun. Johannes Kepler discovered three empirical laws by using the data on planetary motion: Law of Orbits: Each planet moves in an elliptical orbit, with the…
-
Physics MCQs for Class 12 Chapter 9 Ray Optics and Optical Instruments
Last modified on:2 years agoReading Time:10MinutesPhysics MCQs for Class 12 Chapter 9 Ray Optics and Optical Instruments Here we are providing MCQ Questions for Class 12 Physics Chapter 9 Ray Optics and Optical Instrument. Q.1. Which of the following colour of white light deviated most when passes through a prism?(a) Red light(b) Violet light(c) Yellow light(d)…
-
Physics MCQs for Class 12 Chapter 8 Electromagnetic Waves
Last modified on:5 years agoReading Time:36MinutesMCQs on Class 12 Physics Chapter 8 Electromagnetic Waves Q.1. In electromagnetic waves the phase difference between electric and magnetic field vectors are(a) zero(b) 𝜋/4(c) 𝜋/2(d) π Answer Answer: (a) Electric and magnetic field vectors always vary in same phase. Q.2. Which of the following has minimum wavelength? (a) Blue light(b) γ-rays(c) infrared…
