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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

A

made of metal

B

positively charged

C

negatively charged

D

neutral

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The correct Answer is:
D
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