What is charge? And what is this unit postive charge? Is it necessary that unit postive charge will only flow from infinity or a point to a particualr point?

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Solution

Charge is a property of matter that interacts with each other by electromagnetic interaction. There are two types of charges positive and negative.
Charge itself cannot be defined further. It is just like asking define length or time.
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A unit positive charge is an entity which has a positive charge of 1 unit on it.
Here, we use positive charge as a matter of accepted convention.

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