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Question

How can you show that there are two kinds of charges?

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Solution

If two glass rods after rubbing with silk, are hung near each other, then they repel each other, figure (a).

In the same way, when two ebonite rods after rubbing with the cat’s skin are hung near to each other, then they also repel each other, figure (b).

But when glass rod after rubbing with silk and ebonite rod after rubbing with cat’s skin hang near to each other, then they attract each other, figure (c). It is clear that charges on a glass rod and ebonite rod are the opposite. It means that charges are of two types. Charges present in the glass rod are called a positive charge or vitreous and charges present in the ebonite rod are called a negative charge or resinous.

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