Air conditioning gives shopping malls cold and dry conditions. Static charges may accumulate on the soles of your shoes while you are walking inside the mall. If -25 µC is generated by your body, what is their collective mass?

• A. 1.4 × 10⁻⁷ g
• B. 1.4 × 10⁻¹⁴ g
• C. 1.4 × 10⁻¹⁶ g
• D. 1.4 × 10⁻¹³ g

Answer: (D)