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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Electric Field of a Line Charge
Last modified on:3 years agoReading Time:3MinutesElectric Field of a Line Charge Positive charge q is distributed uniformly along a line with length 2a, lying along the y-axis between y=–a and y=+a. We are here interested in finding the electric field at point P on the x-axis. Derivation of electric field due to a line charge: Thus,…
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Electric Field Lines
Last modified on:3 years agoReading Time:5MinutesElectric Field Lines Electric charges create an electric field in the space surrounding them. It is useful to have a kind of “map” that gives the direction and indicates the strength of the field at various places. Field lines, a concept introduced by Michael Faraday, provide us with an easy way…
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Human Ear
Last modified on:4 years agoReading Time:3MinutesHuman Ear The human ear, like that of other mammals, contains sense organs that serve two quite different functions: that of hearing and that of head and eye movements. Anatomically, the ear has three distinguishable parts: the outer, middle, and inner ear. How Human Ear Works? Different sounds produced in our surroundings are collected by…
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Class 10 Science Magnetic Effects of Electric Current (Solved Assignment-01)
Last modified on:5 years agoReading Time:14MinutesVery Short Answer Type Questions: Question 1: State any two properties of magnetic field lines. Solution : Properties of magnetic field lines: (i) The magnetic field lines originate from the north pole of a magnet and end at its south pole. (ii) The strength of magnetic field is indicated by the…
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Android Smartphone Touch Screen
Last modified on:5 years agoReading Time:3MinutesSmartphone touch screens are capacitive which do not use the pressure of the finger to create a change in the flow of electricity. Instead, they work with anything that holds an electrical charge including human skin. (Yes, we are comprised of atoms with positive and negative charges.) Capacitive touch screens are…
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Magnetic field at the centre of a bar magnet is very weak. Why?
Last modified on:5 years agoReading Time:2MinutesWe can divide a bar magnet into a large number of tiny bar magnets. Evaluate, the magnetic field as the superposition of the contributions of all small aligned magnets present in the bar. For a point near the centre of the bar, the magnetic field is very small because the contributions…
