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.
-
Conductors and Insulators
Last modified on:4 years agoReading Time:2MinutesConductors and Insulators Solids are mainly classified into two groups, conductors and insulators. In conductors, electric charges are free to move from one place to another, whereas in insulators they are tightly bound to their respective atoms. In an uncharged body, there are equal number of positive and negative charges. The…
-
Electric Field Due to a Point Charge
Last modified on:3 years agoReading Time:1MinuteElectric Field Due to a Point Charge The electric field produced by a point charge q can be obtained in general terms from Coulomb’s law.First note that the magnitude of the force exerted by the charge q on a test charge q0 is then divide this value by q0 to obtain…
-
Electric Field Due to a Charged Ring
Last modified on:3 years agoReading Time:4MinutesElectric Field Due to a Charged Ring A conducting ring of radius R has a total charge q uniformly distributed over its circumference. We are interested in finding the electric field at point P that lies on the axis of the ring at a distance x from its centre. We divide…
-
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…
-
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…
-
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:…
