Balls 1, 2, 3, and 4 are hanging by strings. A plastic rod, which has been rubbed with wool, is used to touch Ball 1. When the balls are brought near each other, but not touching, the following is observed: Ball 2 is attracted to ball 3 Balls 2 and 4 do not affect one another Balls 2, 3, and 4 are attracted to ball 1 What is ball 4's charge state?

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