An electroscope is given a positive charge, causing its foil leaves to separate. When an object is brought near the top plate of the electroscope, the foils separate even further because, ___.

the object is positively charged

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the object is electrically neutral

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the object is negatively charged

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None of the above

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Solution

The correct option is A
the object is positively charged

The foil leaves are already separated because of the positive charge they have. If a negatively charged object is placed near it, the positive charge on the leaves decreases and they will come closer. Only an object charged positive will induce more positive charge on the leaves end, making them go apart even more.

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