Suppose we have four conductor-coated pith balls A, B, C, and D suspended on non

Question

Suppose we have four conductor-coated pith balls A, B, C, and D suspended on non conducting (e.g., nylon) threads. The charge states of all four balls are initially unknown. We now take a rubber rod, rub it with fur so that it becomes negatively charged, and bring it in contact with sphere A. Then we bring the balls near each other (without contact) two by two. The interactions are as follows: (1) B, C, and D are all attracted to A; (2) B and C have no discernible effect on each other ; (3) B and C are both attracted to D. What are the charge states of A, B, C, and D? Explain your reasoning. In the story above and its conclusions, what were the observations and what were the inferences?

Explanation / Answer

The above experimnet proove the following:

a) A is negatively charged, initally balls B,C, and D are either positive or neutral.

b)As B and C have no effect on each other, they are neutral

c) as B and C are attracted towards D, D is positive charged

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