The actual magnitude of the charge of an electron in coulombs is approximately:
A$9.1 \times 10^{-31}$ C
B$1.602 \times 10^{19}$ C
C$1.602 \times 10^{-19}$ C
D$6.022 \times 10^{23}$ C
Answer & Solution
Correct answer: C. $1.602 \times 10^{-19}$ C
Electron charge magnitude: $1.602 \times 10^{-19}$ coulombs. The negative sign indicates direction; the magnitude is universal.
- **C** ($9.1 \times 10^{-31}$) is the electron's *mass* in kg.
- **D** is Avogadro's number.
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