Which of the following is the unit of mobility of a electron in a conductor?
- A
$\mathrm{kg}^{-1} \mathrm{~s}^2 \mathrm{~A}^{-1}$
- B
$\mathrm{kg}^{-1} \mathrm{~s}^2 \mathrm{~A}$
- C
$\mathrm{kg}^{-1} \mathrm{~ms}^2 \mathrm{~A}^{-1}$
- D
$\mathrm{kg}-\mathrm{ms}^{-1} \mathrm{~A}^{-1}$
✓ Correct answer: B
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