Bonus. (5 points) A bar magnet is held above the floor and dropped. In case (a),
ID: 2040478 • Letter: B
Question
Bonus. (5 points) A bar magnet is held above the floor and dropped. In case (a), the magnet falls through a wire loop. In case (b), there is nothing between the magnet and the floor. If there is induced current, where would that energy come from to produce it in case (a)? a) There is less kinetic energy in case (a) than in case (b). b) Induced current doesn't need energy. c) Energy conservation is violated in case (a). d) No induced current is produced in case (a). e) There is more gravitational potential energy in case (a) than in case (b).Explanation / Answer
Ans: a) There is less kinetic energy in case a than in case b
Due to gravity magnet falls down. If loop is present , current will be induced due to change of flux . The induced current opposes the flow of magnet. That is why kinetic energy willl decrese.