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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Extra Questions for Class 12 Physics Chapter 11 Dual Nature of Radiation and Matter
Last modified on:4 years agoReading Time:11MinutesQ. 1. Name the phenomenon which shows the quantum nature of electromagnetic radiation. Q. 2. Define intensity of radiation on the basis of photon picture of light. Write its SI unit. Q. 3. The figure shows the variation of stopping potential V0 with the frequency n of the incident radiations for…
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Extra Questions for Class 12 Chemistry Chapter 3 Electrochemistry
Last modified on:4 years agoReading Time:5MinutesExtra Questions for Class 12 Chemistry Chapter 3 Electrochemistry Q1. What is the necessity to use a salt bridge in a Galvanic cell? Q2. Out of HCl and NaCl, which do you expect will have greater value for Lm and why? Q3. Give reason :On the basis of E° values, O2…
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Case Study Questions for Class 12 Biology Chapter 15 Biodiversity and Conservation
Last modified on:4 years agoReading Time:4MinutesCase Study Questions for Class 12 Biology Chapter 15 Biodiversity and Conservation Question 1: Within a region, species richness increases with increasing explored area, but only upto a limit. The given graph explains this relationship. (i) What does the given figure show?(a) Rivet-popper hypothesis(b) Species-area relationship(c) Proportionate number of species of…
