Five balls numbered 1 to 5 are suspended using seperate threads . Pairs (1,2) (2,4)(4,1) show electrostatic attraction

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As per your question, if some pairs have been attracted then they might be the pair which gets charged through induction or just by a touch.

There are 3-4 ways for charging to get an object electrostaticly charged. This might be due to induction or convention.

Better to ask your physics teacher to explain you out with basics.

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