A magnetic dipole is under the influence of two magnetic fields. The angle between the field direction is $60^{\circ}$ and one of the field has a magnitude of $1.2 \times 10^{-2}\;T$ If the dipole comes to stable equilibrium to an angle of $15^{\circ}$ with this field , What is the magnitude of the other field ?

Question

$\begin{array}{1 1} 4.4 \times 10^{-3}\;T \\ 4.4 \times 10^{3}\;T \\ 4.4 \times 10^{-4} \;T \\ 4.4 \times 10^{-4} \;T \end{array} $