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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How can you calculate JEE Main 2019 Rank based on NTA Percentile?
Last modified on:5 years agoReading Time:5MinutesThe JEE Main Result for January 2019 session was declared on 19th January 2019 so now to answer the big question that is on everybody’s mind is that How can we calculate JEE Main Rank based on NTA percentile? NTA has released the percentile score for the JEE Main January session.…
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Important Questions For Class 11 Physics Chapter 15- Waves
Last modified on:5 years agoReading Time:6Minutes1. Explosions on other planets are not heard on earth. Why? [1] 2. Why longitudinal waves are called pressure waves? [1] 3. Why do tuning forks have two prongs? [1] 4. A pipe 20 cm long is closed at one end. Which harmonic mode of the pipe is resonantly excited by…
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Important Questions For Class 11 Physics Chapter 14- Oscillations
Last modified on:5 years agoReading Time:8Minutes 1. The girl sitting on a swing stands up. What will be the effect on periodic time of swing? 2. At what distance from the mean position, is the kinetic energy in a simple harmonic oscillator equal to potential energy? 3. A simple harmonic oscillator is represented by the equation…
