A) \[\frac{3\rho {{\ell }^{3}}}{8{{\pi }^{2}}}\]
B) \[\frac{\rho {{\ell }^{3}}}{16{{\pi }^{2}}}\]
C) \[\frac{3\rho {{\ell }^{3}}}{8{{\pi }^{2}}r}\]
D) \[\frac{\rho {{\ell }^{3}}}{8{{\pi }^{2}}r}\]
Correct Answer: A
Solution :
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