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To the right of line PQ is a uniform magnetic field $\overrightarrow{B}$. B₁A is the line of incidence of a charged particle, which comes out of the field along DE; CA and DF are the normals at A and D. B₁AC = $\mathrm{\theta }$ . Angle e measured from CA in clockwise direction is taken as positive. What will be the value of $\mathrm{\theta }$ so that angle subtended by the part that angle subtended by the part of the circle (along which charged particle moves in the field) at its centre and facing the circle is less than $\mathrm{\pi }$? 

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