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I need 20 short answer questions of chapter electrostatics.
I haven't any reference book for now and i have to submit this. so please help me out, it's urgent.
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Answers
Electrostatics is a branch of physics in which static electric field produced by static electric charges are studied.
Electrostatics plays a major role in everyday life. The various applications of electrostatics include photocopiers, defibrillator, paint spraying, electrostatic precipitator etc.
The computer peripheral devices include liquid crystal display (LCD), keyboard, touch pads works on the principle of electrostatics. Electrostatics is used in the agricultural activities like spraying to plants, sorting seeds etc. Electronic components such as capacitors, resistors etc. function based on electrostatics.
History of electrostatics
The natural phenomenon of static electricity has been known since ancient times. The credit of discovery of static electricity goes to Thales of Miletus, around 600BC.
Thales noticed that amber rubbed with wool or cloth attracts lighter objects. This is because amber gains electric charge by rubbing. Further experiments have revealed that, when one object is rubbed with other then both the objects will become charged.
For many years Greeks thought that this phenomenon is due to the unique property of amber. What Thales noticed is nothing but the static electricity. The word electricity is taken from the Greek word elektron which means amber.
In normal state, all the atoms in an object contain equal number of electrons and protons. However, when one object is rubbed with other, few electrons from one object will moves to other. The object that received extra electrons has more number of electrons than protons. So, it becomes negatively charged. Similarly, the object that donates electrons loses few electrons and has less number of electrons than protons. So, it becomes positively charged.
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