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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Sound
Last modified on:5 years agoReading Time:37MinutesSound (i) The sensation felt by our ears is called sound. (ii) Sound is a form of energy which makes us hear. (iii) Law of conservation of energy is also applicable to sound. (iv) Sound travels in form of wave. Production of Sound Sound is produced when object vibrates or sound…
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Work & Energy
Last modified on:5 years agoReading Time:27Minutes Work For doing work, energy is required. • In animals, energy is supplied by food they eat. • In machine, energy is supplied by fuel. Not much work inspite of working hard : Reading, writing, drawing, thinking, analysing are all energy consuming. But in scientific manner, no work…
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Sound (SA)
Last modified on:5 years agoReading Time:13MinutesShort Answer Type Questions-I (2 Marks) 1. Three persons, A, B and C are made to hear a sound travelling through different mediums as given below : Persons Mediums A Iron Rod B Air C Water Who will hear the sound first? Why? [2011 (T-II)] 2. (i) Define the time period…
