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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 

(1) Positively charged

(2) Negatively charged

(3) Neutral

(4) Made of metal

PMT