Exam-style question
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What is the total charge of a proton and an electron?.
- A.0 C
- B.1.6 x 10^-19 C
- C.-1.6 x 10^-19 C
- D.3.2 x 10^-19 C
Model answer
What a good answer should say
- 0 C
Explanation
Why this works
The charge of a proton is +1.6 x 10^-19 C and the charge of an electron is -1.6 x 10^-19 C. When combined, they cancel each other out, resulting in a total charge of 0 C.
Common mistake
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