Two short bar magnets of equal dipole moment M are placed at angle 60º, the magnetic field at point P is (P is on the bisector of the angle between two magnets and d is very large)

• A

  $\frac{{\mu }_0}{4\pi }\frac{\sqrt{3}M}{d^3}$

• B

  $\frac{{\mu }_{ }}{4\pi }\frac{2M}{d^3}$

• C

  $\frac{{\mu }_0}{4\pi }\frac{M}{d^3}$

• D

  $\frac{{\mu }_0}{4\pi }\frac{2\sqrt{3}M}{d^3}$