May I have clear explanations for these

BREIF Proper physical justification MUST be given to receive credit for ALL questions: i.e., provide the fundamental physical justification for your answer. (circle answer=2 points, justification = 3 points) 1. (05 points) In all cases, electromagnetic waves are generated by a. Oscillating magnetic fields b. Oscillating electric fields c. Oscillating electric charges d. Accelerating electric charges e. None of the above 2. (05 points) Lenz's Law expresses the principle that a changing magnetic flux a. is induced so as to reinforce the change in flux b. is induced so as to oppose the change in flux c. Can both reinforce or oppose changes in flux d. Can neither reinforce nor oppose changes in flux e. Creates an electromagnetic wave f. None of the above 3. (05 points) A perfect vacuum is a space with a. No matter b. No force fields c. No electromagnetic waves d. No matter, force fields, or electromagnetic waves e. None of the above 4. (05 points) Electromagnetic waves are different from other waves a. In that they have transverse oscillations b. In that they have longitudinal oscillations c. In that they are both longitudinal and transverse d. In that they do not require a material to propagate through e. none of the above 5. (05 points) If you wave a strong magnet very fast over a heavy conducting metal plate. You feel a. Nothing b. An attractive force c. A repulsive force d. Both an attractive and repulsive force