The source of all magnetism is. a. tiny pieces of iron. b. tiny domains of aligned atoms. c. ferromagnetic materials. d. moving electric charge. e. none above

Which of the following is part of the explanation or description of electromagnetic waves? (select all that apply) a. electrically charged molecules in a medium transfer their energy to nearby electrically charged molecules. b. a changing electric field causes a changing magnetic field. c. magnetic molecules in a medium transfer their energy to nearby magnetic molecules. d. a changing magnetic field causes a changing electric field.