Rubber rods charged by rubbing with cat fur repel each other. ...

[nummyann]

Question 1

In the figure, if Q = 30 μC, q = 5.0 μC, and d = 30 cm, what is the magnitude of the electrostatic force on q?

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15 N

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23 N

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zero

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7.5 N

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38 N

Question 2

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

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Any two rubber rods charged this way have opposite charges on them.

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Any two glass rods charged this way have opposite charges on them.

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A rubber rod and a glass rod charged this way have opposite charges on them.

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All rubber rods always have an excess of positive charge on them.

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All glass rods always have an excess of negative charge on them.

[abctaiwan]

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[nummyann]

Thanks for the timely response, appreciate it

[juliaf]

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