A) \[{{\mu }_{{{0}_{{}}}}}\pi {{r}^{3}}n\frac{\sigma }{{{y}^{3}}}\]
B) \[2{{\mu }_{{{0}_{{}}}}}\pi {{r}^{3}}n\frac{\sigma }{{{y}^{3}}}\]
C) \[\left( \frac{{{\mu }_{0}}}{4\pi } \right){{r}^{3}}n\frac{\sigma }{{{y}^{3}}}\]
D) \[\left( \frac{{{\mu }_{0}}}{2\pi } \right){{r}^{3}}n\frac{\sigma }{{{y}^{3}}}\]
Correct Answer: A
Solution :
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