The radius of a charged metal sphere $(R)$ is $10 \, cm$ and its potential is $300 \, V$. Find the charge density on the surface of the sphere.
- A$2 \times 10^{-3} \, CGS \, esu$
- B$4 \times 10^{-3} \, CGS \, esu$
- C$6 \times 10^{-3} \, CGS \, esu$
- D$8 \times 10^{-3} \, CGS \, esu$
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