Question

how can we identify that a body is negatively or positively charged ?
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Answer 1

Answer:

In order to tell the sign of an object charge, you need another object with a known positive or negative charge. If you rub a piece of glass with silk, it will have a positive charge (by convention). If you rub a piece of amber with fur, it will have a negative charge (also by convention).

Explanation:

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Answer 2

Explanation:

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