A charged particle moving through a magnetic field experiences a force. In this experiment, the velocity of the accelerated electrons is perpendicular to the magnetic field, giving rise to centripetal motion, and the electrons will move in a circular path. The magnetic field can be ound by using the Biot-Savart law. For a single coil carrying current through a single loop (N-1) on the xy plane, of radius a, the magnetic field along the z-axis is given by: Equation (1) Cl 2(a2 +z2)3/2