We design and construct a device to map the magnetic field generated by a supercurrent in a
rectangular cross section ring of YBa 2 Cu 3 O 7− δ . For the measurements of the magnetic field, we
develop a Gaussmeter based on a commercial Hall effect sensor coupled to an Arduino microprocessor.
Our results show an asymmetric distribution of the magnetic field intensity measured at a certain
distance along a plane parallel to the ring surface. The behavior of the magnetic field intensity
with distance along the ring axis is closely related to what is expected for a toroid. Using the
Biot–Savart law and the measured magnetic field values, the induced supercurrent is determined.