statics

Question: A uniform rod AB of length a hangs with one end against a smooth vertical wall, being supported by a string of length l, attached to the other end of the rod and to a point of the rod vertically above B. If the rod rests inclined to the wall at an angle $\theta $, then ${{\cos }^{2}}\theta =$

1) $\frac{({{l}^{2}}-{{a}^{2}})}{{{a}^{2}}}$

2) $\frac{({{l}^{2}}-{{a}^{2}})}{2{{a}^{2}}}$

3) $\frac{({{l}^{2}}-{{a}^{2}})}{3{{a}^{2}}}$

4) None of these

Solution:

Explanation: No Explanation

Equilibrium of co-planar forces

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