Strength of Magnetic Field Formula

Equation for calculate strength of magnetic field is,

$$B=\frac{\mathrm{<i>\mu </i>₀}m}{\mathrm{4\pi }\mathrm{r³}}x\sqrt{1+3{\sin }^2\lambda }$$

where,
μ₀ = permeability of free space (µ₀ = 4π×10⁻⁷ H·m⁻¹ ≈ 1.2566370614…×10⁻⁶H·m⁻¹ or N·A⁻²)
m = dipole moment (VADM=virtual axial dipole moment)
r = distance from the center
λ = magnetic latitude from the dipole axis (equal to 90° − θ) where θ = magnetic colatitude
B = strength of the field