If a magnetic dipole is formed by making a current loop smaller and smaller, but keeping the product of current and area constant, the limiting field is B ( r ) = μ μ 0 4 π π [ 3 r ^ ^ ( r ^ ^ ⋅ ⋅ m ) − − m | r | 3 + 8 π π 3 m δ δ ( r ) ] . Unlike the expressions in the previous section, this limit is correct for the internal field of the dipole.