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### Discussion :: Engineering Mechanics

1. The frequency of oscillation of a torsional pendulum is

2.  A. $$\frac { 2nk } { r } \sqrt \frac{ g }{ l }$$ B. $$\frac { r} { 2nk } \sqrt \frac{ l }{ g }$$ C. $$\frac { 2nr } { k } \sqrt \frac{ g }{ l }$$ D. $$\frac { r } { 2nk } \sqrt \frac{ g }{ l }$$