Four wires meet at a junction. in two of the wires currents i1 = 1.67 a and i2 = 2.37 a enter the junction. in one of the wires current i3 = 6.85 a leaves the junction. find the current in the fourth wire and indicate its direction.

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.