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I need help with this problem please. I took this once and only got partial credit...

I need help with this problem please. I took this once and only got partial credit so I don’t know if one of my answers is wrong or if I’m missing another possibility. I answered “we need to do more experiments to determine the sign of the net charge on each ball”, “2 and 3 carry charges of the opposite sign”, and “1 and 2 carry charges of the same sign”.
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Answer #1

Due to the electric force between two charges , if the charges are same they repel. But if unlike charges attract each other.

Answer and explanation is shown below.

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