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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Frictional Electricity
Last modified on:3 years agoReading Time:10Minutes What is frictional electricity? Frictional electricity, also known as static electricity, is the type of electricity that results from the friction or rubbing of two objects together. When two objects are rubbed against each other, the friction between them can cause the transfer of electrons from one object to the…
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Alternating Current
Last modified on:3 years agoReading Time:24Minutes What is Alternating Current (A.C.)? Alternating Current (AC) is an electrical current that periodically reverses direction in a circuit. Unlike Direct Current (DC), which flows only in one direction, AC constantly changes its polarity and magnitude over time. Explanation: In an AC circuit, electrons periodically switch direction, moving back and…
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Terminal Velocity
Last modified on:3 years agoReading Time:13Minutes What is Terminal Velocity? Terminal velocity is the constant maximum speed reached by an object in free fall or falling through a fluid (such as air or water) when the force of air resistance or fluid resistance becomes equal in magnitude and opposite in direction to the force of gravity…
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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…
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Why does the earth rotate?
Last modified on:5 years agoReading Time:3MinutesThe reason for the rotation of earth and planets arise from the concept of formation of our solar system. In the beginning solar system was a big cloud of dust and gases. This cloud began to collapse, flattening into large disk, rotating faster and faster continuously, as they collapsed, their gravitational…
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Is light visible or invisible?
Last modified on:5 years agoReading Time:2MinutesLight is invisible until it hits an object. It can only be visible to us whenever it get scattered or bounced off the dust particles in the intervening medium. We can see the source of light like stars at night as they are too dim to light up much but that…
