A hollow metal ball $8\,\text{cm}$ in diameter is given a charge $-4\times10^{-8}\,\text{C}$. The potential on the surface of the ball is:
- A$0$
- B$-90\,\text{V}$
- C$-9000\,\text{V}$
- D$-900\,\text{V}$
✓ Correct answer: C
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