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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A parallel plate capacitor is made of two square plates of side ‘a’, separated by a distance d (d<
Last modified on:5 years agoReading Time:1Minute Question: A parallel plate capacitor is made of two square plates of side ‘a’, separated by a distance d (d<<a). The lower triangular portion is filled with a dielectric of dielectric constant K, as shown in the figure. Capacitance of this capacitor is: Solution:
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NEET Chapter-Wise Test Series
Last modified on:4 years agoReading Time:3MinutesNEET Chapter-Wise Test Series NEET exam is incomplete until you practice well before the exam. If you want to do quick revision and check your grasp over a particular chapter then this is for you. Here is the ‘Gurukul Test Series’ for upcoming NEET Exam. Take this test series as it…
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Rusting of iron
Last modified on:3 years agoReading Time:11MinutesRusting of iron Iron is a metal that is used extensively in making buildings, bridges, rails, machinery and many other articles. However, the problem with iron is that, when it comes in contact with moist air, it slowly reacts with oxygen to form hydrated ferric oxide, a brown powdery substance, commonly…
