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A metal sphere is insulated electrically and is given a charge. If 21 electrons are added to the sphere in giving a charge, how many Coulombs are added to the sphere? A metal sphere is insulated electrically and is given a charge. If 21 electrons are added to the sphere in giving a charge, how many Coulombs are added to the sphere? -3.4 × 10-20 C -21 C -34 C -3.4 × 10-18 C

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cjrodriguez89

Answer:   -3.4 . 10⁻¹⁸ C

Explanation:

Each electron carries a charge of  -1.6 . 10⁻¹⁹ C, which is the smallest discrete charge possible in the universe.

If we add 21 electrons to the insulated sphere, the added charge will be as follows:

Q = 21 . 1.6. 10⁻¹⁹ C = -3.4. 10⁻¹⁸ C.

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