Question

An object is found to have a charge of -3μC. What does this mean in terms of the number of electrons?

Group of answer choices
a. A deficit of 5.33 x 10^12 electrons.
b. A deficit of 6.02 x 10^23 electrons.
c. An excess of 5.33 x 10^12 electrons.
d. A deficit of 1.88 x 10^13 electrons.
e. An excess of 1.88 x 10^13 electrons.

Answer 1

An object with a charge of -3µC has an excess of 1.88×10^{13} electrons, since the charge of an electron is -1.60x10^{-19} C and the excess charge equals the object's total charge divided by the charge per electron.

Step-by-step explanation:

An object with a charge of -3µC means it has an excess of electrons. To determine the number of excess electrons, we divide the total charge by the charge per electron. The charge of one electron is approximately -1.60×10-19 C. By using the formula:

µC to C = -3µC × 10-6 = -3×10-6 C

Number of excess electrons (ne) = Total charge / Charge per electron

ne = -3×10-6 C / -1.60×10-19 C/e- = 1.875×1013 electrons

Therefore, the correct answer is an excess of 1.88×1013 electrons. This corresponds to answer choice e.