PHYWE Measuring the Magnetic Field of a Pair of Helmholtz Coils Using a Teslameter

Principle The spatial distribution of the field strength between a pair of coils in a Helmholtz arrangement is measured. The distance over which a uniform magnetic field is produced is investigated and the superposition of the two individual fields to form the combined field of the pair of coils is demonstrated. Advantages Very uniform magnetic field and high flux density due to the large diameter of the Helmholtz coil Helmholtz coils are suitable for many other elementary experiments Objectives To measure the magnetic flux density along the z-axis of planar coils when the distance between them is alpha = R (R = radius of the coils) and when it is greater and less than this. To measure the spatial distribution of the magnetic flux density when the distance between the coils is alpha = R using the rotational symmetry of the setup: a) measuring the axial component Bz; b) measuring the radial component Br. Measure the radial components B´r and B"r of two separate coils in a plane midway between them and demonstrate the overlap of the two fields at Br = 0. Learning Objectives: Maxwell's equations, wire loop, flat coils, Biot-Savart law, Hall effect.