Visualization Lorentz Force with Tea Leaves for Studying Magnetic Field in Senior High School

Abstract

The purpose of this study is to visualize the motion of the Lorentz force using tea leaves for learning magnetic fields in high school. Based on assessment needs results of students who attend school in Jakarta, 56.7% of students have difficulty determining the direction of the Lorentz force, 95% of students have a better understanding of the direction of the Lorentz force if it can be visualized. This research uses the R&D method, which refers to the ADDIE model. The Lorentz force visualization (Vigalo) consists of a power generator, tea leaves, two copper wires, two neodymium magnets, and an adjustable voltage source of 1.5 volts - 6.0 volts. The two permanent magnets are placed separately at a distance of 2 cm and able to produce a magnetic field of 88.6634 Gauss. The voltage source is connected to the experiment box and can see the movement of tea leaves and visualize Lorentz force direction lines that match the right-hand rule. This experiment shows that visualization Lorentz force with tea leaves can be used in learning magnetic field material in senior high school.