Question
Five balls numbered 1 to 5 are suspended using separate threads. Pairs (1, 2), (2, 4) and (4, 1) show electrostatic attraction, while pair (2, 3) and (4, 5) show repulsion. Therefore ball 1 must be(a) Positively charged(b) Negatively charged(c) Neutral(d) Made of metal
       

Answer

(c) Neutral

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