Question: Charged plastic and glass rods hang by threads. a. An object repels the plastic rod. Can you predict what it will do to the glass

Charged plastic and glass rods hang by threads.
a. An object repels the plastic rod. Can you predict what it will do to the glass rod? If so, what? If not, why not?
b. A different object attracts the plastic rod. Can you predict what it will do to the glass rod? If so, what? If not, why not?

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