Magnetism and Electromagnetism - The study of magnetism explores magnetic forces and how materials exhibit magnetic properties. Electromagnetism unites electricity and magnetism, showing their interconnected nature and the generation of electromagnetic waves.Applications and Related Fields - Magnetic fields are crucial in technologies like MRI and fusion energy research. Related fields include magnetohydrodynamics (MHD) and geomagnetism, studying the interaction of magnetic fields with fluids and the Earth's magnetic field, respectively.