What creates voltage difference in a battery?

What are similarities and differences of reflection, refraction, diffraction and absorption?

Part 1: a magnetic levitation or maglev train rides rails without touching them. explain how this works using your data. include the appropriate magnet drawing in your answer. part 2: two objects are near a bar magnet. one is about 1 cm away, while the other is 6 cm away. compare and contrast the magnetic force that affects each object. use your data to answer the question

Write down two additional questions about earth's magnetic field that will make your presentation more informative.