Discussion
The potential difference of an energy source that provides 50 mJ of energy for every micro coulomb of charge is -
Answer: D
The potential difference is 50 kV.
Potential difference is energy per unit charge, \(V = W/Q\).
\[ \begin{aligned} V &= \frac{50 \times 10^{-3}\ \text{J}}{1 \times 10^{-6}\ \text{C}} \\ &= 5 \times 10^{4}\ \text{V} = 50\ \text{kV} \end{aligned} \]
50 V comes from ignoring the difference between the milli- and micro- prefixes, and 5 V and 500 V misplace the power of ten in other ways.
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