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18. In a solid conductor such as a metal, what is the cause of an electric current? A. A flow of positive and negative charges. B. A flow of positive charges only. C. +A flow of negative charges only.
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18. In a solid conductor such as a metal, what is the cause of an electric current? A. A flow of positive and negative charges. B. A flow of positive charges only. C. +A flow of negative charges only. D. A flow of protons. E. A flow of neutrons.

User Jaytjuh
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The answer is A. A flow of positive and negative charges.
User Thanhnd
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