Two short magnets P and Q are arranged such that centres are on the x- axis and are separated by large distance the magnetic axis of P and Q are along X and Y axes respectively. At a point $R_1$ mid way between their centers , the magnitude of total induction at R due to both magnet is $ (if B is magnitude of induction due to a)

Question

$\begin{array}{1 1} \sqrt 2 \;B \\ \sqrt 3 \;B \\ 2 \;B \\ \sqrt 5 \;B \end{array} $