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please answer soon.... How to identify whether a given object has a positive or negative charge???

please answer soon....
How to identify whether a given object has a positive or negative charge??? 

Grade:8

8 Answers

Yugabrat Gogoi
47 Points
9 years ago
@ Saloni, to find whether a given object is positivelycharged or negetively, we can use an object which is positively charged. If the given object is repelled then we will know that it is positively charged and if it is attracted then we will know that it is negetively charged........
Saloni Rakholiya
104 Points
9 years ago
but yugabrat ,  to bring a positively charged object near an other object , we need to know whether the object is positively charged . and that is my question........how to identify an positive or negative charge ...
Yugabrat Gogoi
47 Points
9 years ago
@saloni we can do it by bring the article near a gold leaf electroscope. if a positively charged object is brought towards the top of the figure below, the 2 gold leaf will move towards the opposite direction and if a negatively charged object is brought towards the top of the figure below, they will sick each other.
Yugabrat Gogoi
47 Points
9 years ago
@saloni we can do it by bring the article near a gold leaf electroscope. if a positively charged object is brought towards the metal cap of the figure below, the 2 gold leaf will move towards the opposite direction and if a negatively charged object is brought towards the metal cap of the figure below, they will stick each other.
Saloni Rakholiya
104 Points
9 years ago
yugabrat can you answer why this occurs?? why the strip goes to the opposite or comes closer in direction
Yugabrat Gogoi
47 Points
9 years ago
When the cap is touched with a charged object, the charge flows down the metal rod and the gold leaf. Since both conductors will have an excess of the same type of charge, the repulsion between like charges causes the gold-leaf to be deflected from the end of the rod.
Yugabrat Gogoi
47 Points
9 years ago
and vice-versa
 
Yugabrat Gogoi
47 Points
9 years ago
its the law of magnetism . same pole attracts and opposite pole attracts.

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