Lorentz Force Lab

thingiverse

Apparatus to hold flat neodymium magnets (2 x 1 x 1/16 in.) creates a moderately uniform magnetic field between the magnets, making it possible to place the whole apparatus on a scale. Placing a wire segment with horizontal current flow between the magnets exerts a force proportional to the current according to the Lorentz Force Law: Force = (current) * (length of horizontal wire) cross-product (Magnetic Field). The wire should be shaped like a U with a flat bottom, with a horizontal segment approximately 1 in. long and turning at right angles upward at both ends to avoid contributing to the force calculation. This setup allows for measuring the magnetic field between the magnets. Additionally, the top of the apparatus can rotate, enabling observation of the dependence on angle in the cross-product. For example, magnets suitable for this setup are available at magnet4sale.com/n45-2x1x1-16-neodymium-rare-earth-block-magnet/. Important considerations include: * Fasteners may break when dropped or during assembly if not handled carefully; printing an extra set is recommended. * For moderate currents of approximately 5 amps, the scale must be sensitive to tenths of a gram. Printing settings: Print orientation: largest flat surface down Top piece: right side up Bottom and fastener: upside down Layer thickness: 0.15 Additional notes: * Resolution: 0.15 * Supports: No * Rafts: No