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A plastic rod is rubbed with a piece of animal fur. The plastic rod acquires a negative charge during this process. Which of the following is true about the charge on the piece of fur?

Question

A plastic rod is rubbed with a piece of animal fur. The plastic rod acquires a negative charge during this process. Which of the following is true about the charge on the piece of fur?

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Solution

The piece of fur acquires a positive charge. This is due to the law of conservation of charge which states that the total charge in an isolated system is constant. When the plastic rod is rubbed with the fur, electrons (which carry a negative charge) are transferred from the fur to the rod. This leaves the rod with an excess of electrons, giving it a negative charge. Conversely, the fur now has a deficit of electrons, giving it a positive charge.

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