Question

Two identical balls of mass 0.9 g each are charged by the same charges. Joined by the thread and suspended from the ceiling

Answer 1

The balls will move away from each other because like charges repel.

The bottom ball  will push away the top one making it look like the top one is levitating.

If they had different charges i.e unlike charges, the ball would attract to each other.

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Answer 2

Explanation:

The above attached picture gives you the answer.