In order for an object to be in a charged state, which two particles must be in a state of imbalance?

A. protons and electrons
B. protons and neutrons
C. neutrons and electrons
D. atoms and molecules


Answer: A

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____________________ wheels are used for removing dirt and rust from machine parts

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Which countries grow more tonnage of aquatic animals than any other region?

a. Asian c. North American b. European d. Mediterranean

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CO? reading inside buildings that are greater than atmospheric is the result of ____________

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