Exam-style question
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If the specific charge of an electron is 1.76 x 10^11 C/kg, what is the mass of the electron if its charge is -1.6 x 10^-19 C?.
- A.9.11 x 10^-31 kg
- B.1.6 x 10^-19 kg
- C.1.76 x 10^-11 kg
- D.9.76 x 10^-31 kg
Model answer
What a good answer should say
- 9.11 x 10^-31 kg
Explanation
Why this works
To find the mass of the electron, we can rearrange the specific charge formula: mass = charge / specific charge. Substituting the values, we have mass = (-1.6 x 10^-19 C) / (1.76 x 10^11 C/kg).
This calculation yields a mass of approximately 9.11 x 10^-31 kg, which is the known mass of an electron.
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