Four lightweight balls a b c and d are suspended by threads

Reference no: EM13633776

Four lightweight balls A, B, C, and D are suspended by threads. Ball A has been touched by a plastic rod that was rubbed with wool. When the balls are brought close together, without touching, the following observations are made:

Balls B, C, and D are attracted to ball A.
Balls B and D have no effect on each other.
Ball B is attracted to ball C.

What are the charge states (glass, plastic, or neutral) of balls A, B, C, and D?

Reference no: EM13633776

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