Ametal 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

  -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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