9) Figure shows two small identical magnetic dipoles a and b of magnetice moments M each, placed at a sepration 2d, with their axis perpendicular to each other. The magnetice at the point P mid way between the dipoles each.
$$\begin{gathered} 1) \frac{2{\mu }_{0}M}{4{\mathrm{\pi d}}^3} \\ 2) \frac{{\mathrm{\mu }}_0\mathrm{M}}{4{\mathrm{\pi d}}^3} \\ 3) \mathrm{Zero} \\ 4) \frac{\sqrt{5}{\mathrm{\mu }}_0\mathrm{M}}{4{\mathrm{\pi d}}^3} \end{gathered}$$