Biot-Savart 3D Field Explorer

The magnetic field of arbitrary current loops computed directly from the Biot-Savart law and shown as a 3D lattice of arrow glyphs coloured by |B| with traced field lines and an on-axis Bz profile. Presets give the straight wire (B falling as 1/r), the single circular loop, a Helmholtz pair (the central region where the field is most uniform), and a solenoid (a nearly uniform interior with return flux outside); current and coil radius are sliders and you drag to orbit.