Please answer these multiple choice questions with clear physics diagram and justification

1. (05 points) Two identical bar magnets are dropped from equal heights. Magnet A is dropped from above over a smooth flat patch of earth. Magnet B is dropped from above a heavy copper plate. Which magnet strikes first? a. magnet A b. magnet B c. both strike at the same time. d. whichever magnet has its north pole towards the ground. e. whichever magnet has its south pole towards the ground. 2. (05 points) If a compass is moved from the northern hemisphere to the southern hemisphere, its magnetic needle will change direction a. by 180 degrees. b. depending on where the measurement is taken. c. by 90 degrees. d. hardly at all. e. none of these. 3. (05 points) When a bar magnet is thrust into a coil of copper wire, the coil tends to a. attract the magnet as it enters. b. repel the magnet as it enters. c. both of these. d. neither of these. 4. (05 points) An electromagnet powered by an AC source can do work on a metal object. a. True b. True only if the material it acts on is ferritic (like Fe, Co, or Ni) c. False 5. (05 points) Starting from first principles, show that the product of Ohms times Farads has units of seconds