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How Electrostatics Influence Our Lives Essay

1703 words - 7 pages

Physics EssayHow electrostatics influence our lives?IntroductionWe all are familiar with the term electricity which comes from batteries and which is used to light bulbs, buzzers, and other electrical devices. We also know that conductors are those objects which conduct electricity easily and insulators do not conduct electricity at all. This is basic knowledge but right now we are going into detail about electricity and static electricity.ElectrostaticsMany of us have this wrong concept in our mind that insulators like plastic and wood cannot carry charges at all. This is a wrong concept. The truth is that most insulators carry a special type of charge which conductors do not carry. The ...view middle of the document...

More affinity to electrons - Becomes negatively charged

Less affinity to electrons - Becomes positively charged

Polythene

Glass Rod

Paraffin Wax

Perspex

Electrostatic InductionWe have so far seen how insulators are charged by rubbing then with each other. Now we will see how insulators are charged without contact by the process of Electrostatic Induction.When the positively charged glass rod is bought near the two connected balls, all the electrons in both the balls are attracted towards the glass rod and move to the left side (unlike charges attract). Also the remaining positively charged particles move away from the glass rod toward the right side (like charges repel). When the two balls are separated, the left one will be negatively charged ad the right one will be positively charged.When the positively charged rod is bought close to the ball, all the electrons in the ball are attracted towards the glass rod and move to the left side (unlike charges attract). Also the remaining positively charged particles move away from the glass rod toward the right side (like charges repel). Then if we earth the right side of the ball, electrons come and neutralize the positive charges and so the ball becomes negatively charged.Note that the balls are mounted on insulators so that they are not earthed and neutralized.Uses of Electrostatics in our daily livesDust Precipitators:This is a machine used to clean the smoke produced by factories. In this smoke is passed through a meshwork of wires which are negatively charged. As the dust particles touch the wires, they get extra electrons and also become negatively charged. However the air molecules are small and stable and so they do not acquire any charge. Then as the particles move up, the negatively charged particles are attracted to positively charged metal plates fixed on the side of the box. This way the dust is removes form the dirty smoke and clean air is released.Lightning Arrestors:Often you can see that on top of buildings, there is a short and sharp metal rod present which has been grounded. This is known as a lightning arrestor or conductor. It prevents lightning from touching the building and so protecting it.When lightning (electricity) produced touches the rod, the metal rod (being a good conductor) conducts all the electricity and becomes charged. However the current keeps flowing and is grounded and neutralized.Static Mats:The main principal behind this is using the fact that air becomes negatively charged and as foot traffic or wheels pass over the surface of the mat (which is positively charged) the dirt is attracted to the mat and so it controls the cleanliness of the surroundings.Photocopiers:A photocopy machine is one of the greatest inventions of man. It allows us to duplicate any piece of paper. This is how electrostatics is used to photocopy papers.Firstly positive charge is sprayed onto the plate from a high voltage power supply. Paper is then placed through the plate and a...

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