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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IIT Foundation Mathematics Problems on Area and Perimeter
Last modified on:5 years agoReading Time:6MinutesQ.1. If the sides of a triangle are 3 cm, 4 cm and 5 cm, then what is the radius of the circum-circle? Answer Answer: 2.5 cm Q.2. If the length of hypotenuse of a right angled triangle is 5 cm and its area is 6 sq cm, then what are…
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IIT Foundation Mathematics Problems on Permutation and Combination
Last modified on:5 years agoReading Time:4MinutesQ.1. Each section in first year of plus two course has exactly 30 students. If there are 3 sections, in how many ways can a set of 3 student representatives be selected from each section? Answer Answer: 27000 Q.2. How many numbers are there between 100 and 1000 such that every…
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IIT Foundation Mathematics Problems on Probability
Last modified on:5 years agoReading Time:4MinutesQ.1. If two coins are tossed once, what is the probability of getting at least one head ? Answer Answer: 3/4 Q.2. Two unbiased dice are rolled. Find the probability of getting a multiple of 2 on one die and a multiple of 3 on the other die ? Answer Answer:…
