Five balls numbered 1,2,3,4,and 5 are su...

Five balls numbered 1,2,3,4,and 5 are suspended using separated threads. The balls (1,2),(2,4) and (4,1) show electrostatic attraction while balls (2,3) and (4,5) show repulsion. Therefore, ball 1 must be

positively charged

negatively charged

neutral

made of metal

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