Charging an object by Friction
Charging an object by Friction
Charging an Object: Atoms usually have equal number of positive and negative charges, and are, therefore, electrically neutral. This is the reason why most objects around us are electrically neutral. An electrically neutral object can be charged by using any of the following methods.
Charging by friction: This kind of charging is done by rubbing one material with another. This produces on equal and opposite charge in both the bodies. The most common examples are rubbing glass with silk, and ebonite (a kind of hard rubber) with wool.
Static electricity builds when two different non- metal materials rub together. Rubbing or friction makes the electrons move.This give one material a positive charge and other a negative charge.When glass rod is rubbed with silk, it aquires positive cahrge and by convention silk will aquire some amount of neagative charge. Similarly when plastic rod rubbed with fur it aquires negative sharge, and the fur itself is found to acquire a positive charge. Moreover , if the rod and fur are brought into contact with one another, the charge is found to disappear from both. Similar observations are true for the glass rod and silk cloth.
During dry weather, while combing hair, sometimes we experience hair flying apart.The force responsible for this is | |||
| Right Option : B | |||
| View Explanation | |||
When glass rod is rubbed with silk piece the charge acquired on the glass rod is: | |||
| Right Option : A | |||
| View Explanation | |||
An inflated rubber balloon is rubbed with a woollen cloth whereas a ballpoint pen refill is rubbed with a polythene bag. Which of these will get positively charged?
| |||
| Right Option : B | |||
| View Explanation | |||
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