The radius of a charged metal sphere (r) is 10 cm and its potential is 300 v. find the charge density onthe surfaceof the sphere :
a. 2x10⁻³ cgs esu
b. 4x10⁻³ cgs esu
c. 6x10⁻³ cgs esu
d. 8x10⁻³ cgs esu