Problem: A plastic rod is charged up by rubbing a wool cloth, and brought to an initially neutral metallic sphere. It  is allowed to touch the sphere for a few seconds, and then is separated from the sphere by a small distance. After the rod is separated, the rod A) feels no force due to the sphere. B) is attracted to the sphere. C) is repelled by the sphere.

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Problem Details

A plastic rod is charged up by rubbing a wool cloth, and brought to an initially neutral metallic sphere. It  is allowed to touch the sphere for a few seconds, and then is separated from the sphere by a small distance. After the rod is separated, the rod

A) feels no force due to the sphere.

B) is attracted to the sphere.

C) is repelled by the sphere.

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What scientific concept do you need to know in order to solve this problem?

Our tutors have indicated that to solve this problem you will need to apply the Charging Objects concept. You can view video lessons to learn Charging Objects. Or if you need more Charging Objects practice, you can also practice Charging Objects practice problems.

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Based on our data, we think this problem is relevant for Professor Chen's class at USF.