A) \[2\pi \sqrt{\frac{\ell d}{\rho g}}\]
B) \[2\pi \sqrt{\frac{\ell \rho }{dg}}\]
C) \[2\pi \sqrt{\frac{\ell d}{(\rho -d)g}}\]
D) \[2\pi \sqrt{\frac{\ell \rho }{(\rho -d)g}}\]
Correct Answer: A
Solution :
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