Find magnetic field at point $P$ in given diagram.
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${{\text{B}}_{\text{p}}} = \frac{{{\mu _0}{\text{i}}}}{{4\pi {\text{a}}}}\left( {\cos {\alpha _1} - \cos {\alpha _2}} \right)0$
$ = \frac{{{\mu _0}{\text{i}}}}{{4\pi {\text{a}}}}\left( {\cos {{30}^\circ } - \cos {{60}^\circ }} \right)$
$ = \frac{{{\mu _0}{\text{i}}}}{{8\pi {\text{a}}}}(\sqrt 3 - 1) \odot $
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