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1 March, 22:10

Rubber rods charged by rubbing with cat fur repel each other. Glass rods charged by rubbing with silk repel each other. A rubber rod and a glass rod charged respectively as above attract each other. A possible explanation is that a. Any two rubber rods charged this way have opposite charges on them. b. Any two glass rods charged this way have opposite charges on them. c. A rubber rod and a glass rod charged this way have opposite charges on them. d. All rubber rods always have an excess of positive charge on them. e. All glass rods always have an excess of negative charge on them.

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  1. 1 March, 22:40
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    C. A rubber rod and a glass rod charged this way have opposite charges on them.

    Explanation:

    When a rubber rod is rubbed against cat fur, it acquires a negative charge, it becomes negatively charged.

    When you then try to bring two rubber rod's together, they repel because like charges repel.

    Meanwhile, when you rub a glass rod against silk, it loses electrons to the silk material and becomes positively charged.

    When you bring two positively charged glass rod's together, they repel, because like charges repel.

    However, when you bring the rubber rod and a glass rod together, the attract each other because unlike/opposite charges attract.
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