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3. Supposed one pith ball attracts the other. A third ball is negative and repels Ball...

3. Supposed one pith ball attracts the other. A third ball is negative and repels Ball 2. What can be concluded about Ball 1? What additional observations could give more information.

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Answer #1

As Ball 3 is negative and it repels ball 2, so, ball 2 must be of same polarity as ball 3, as we know that two same polarity charges repel each other. Thus ball 2 is also negatively charged. Again ball 2 attracts ball 1 and as attraction happens between two opposite polarity charges, so, ball 1 must be positively charged.

One additional observation could be made about ball 3 and ball 1. Since they are oppositely charged (one positive and other negative), so balls 1 and 3 will attract each other.

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