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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Charging of Insulators
Last modified on:4 years agoReading Time:2Minutes 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…
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Charging by Contact
Last modified on:4 years agoReading Time:2Minutes Charging by Contact When a negatively charged ebonite rod is rubbed on a metal object, such as a sphere, some of the excess electrons from the rod are transferred to the sphere. Once the electrons are on the metal sphere, where they can move readily, they repel one another and…
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Charging by Rubbing
Last modified on:4 years agoReading Time:3Minutes Charging by Rubbing The simplest way to charge certain bodies is to rub them against each other. When a glass rod is rubbed with a silk cloth, the glass rod acquires some positive charge and the silk cloth acquires negative charge by the same amount. The explanation of appearance of…
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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…
