Question

If you drop a bar magnet down a tube made of conducting material (like copper or aluminum) something interesting happens: the bar magnet does not simply accelerate all the way down under the influence of gravity. Instead, there are forces that oppose the motion and cause the bar magnet to descend at essentially a constant velocity. Suppose you do this two times: once with the north pole of the magnet facing down and the second time with the north pole facing up. Note that for the purposes of orientation, imagine you are looking down the tube as the magnet descends and moves away from you. 10) Which combination of options below is most accurate? [Enter your answer as a string of the letter options you believe are correct. For instance, if you think options A, D, and E are correct, then enter "ADE"] A) Magnetic forces will not affect the magnet either time. B) During the first drop, the part of the tube below the magnet develops a clockwise current. C) During the first drop, the part of the tube above the magnet develops a counterclockwise current. D) During the second drop, the part of the tube above the magnet develops a clockwise current. E) None of the above Answer: Submit All Answers

Answer 1

bas magnet fallun tuseugh Aluminium tube a copper or with north pole facung dour wrhen magnel is above tube, magnet freld ncseases dlue to lenz law whenevee magmehe lur changes emf is mduced (agamst that change) (1) Bar magnet ean Copper Tube

magnetic breld vs maearmg, thiu mealase in magnetric flux pnoduce a counter clockwue usent to oppose uie magmehe tur of bar magnet AD when bas magnet is dsopped aith horth pole faccng up orl South Pole facung doww magnetic tield lunes staut rom nett pole amd end at South pole hhen he bar magmet talls twrth South pale faciug down. feld lunu seems to be fong out the top af magnet Hux'a geting smatler ih magnitude , So a Barth pole Ahould be mduced above the coil (which means capper Pule COvnktar cloclewise Cussent wle hi uouing in tube. tinduted cus ent will generate ma'gmeh'c fuld to sepel the maguet) Cpton ae c and d