![]() Spinning a magnet in a coil of wire generates electricity. If electric current flows in a coil, it experiences a force and moves. Slightly increasing the distance between the coils improves the uniformity at the coils plane but decreases it in the center. GCSE WJEC Electromagnetism WJEC Magnetic field lines. ![]() Both coils are then powered by an equal current flowing in the same direction.īy setting the distance between the two coils to the radius of the coils, R, the magnetic field uniformity in the center area between the coils is maximized but the field strength at the plane of the coils is around 7% lower. The basic set-up consists of two coils that are separated from each other by a specific distance, for circular coils this is the same as the radius of the coils. A Helmholtz Coil is a set-up of coils, normally two per axis, that creates a near uniform magnetic field between them.
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