Tessellate S.T.E.M.S - Physics - School - Set 3 - Problem 3

Two point charges $q_1$ and $q_2$ are separated by $10$ cm. Consider a field line L as shown in figure.

If $\alpha = 60^o$ , $q_2 = -3$ , $q_1 = +2$ , then $\sin (\frac{\beta}{2})$ is ?

This problem is a part of Tessellate S.T.E.M.S.