A) \[\frac{1}{2}\,\frac{{{\mu }_{0}}\pi {{a}^{4}}}{{{l}^{3}}}\]
B) \[\frac{1}{2}\,\frac{{{\mu }_{0}}\pi {{a}^{4}}}{{{l}^{2}}}\]
C) \[\frac{{{\mu }_{0}}}{4\pi }\frac{\pi {{a}^{4}}}{{{l}^{2}}}\]
D) \[\frac{{{\mu }_{0}}}{\pi }\frac{{{a}^{4}}}{{{l}^{3}}}\]
Correct Answer: A
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