A bar magnet is held above the floor and dropped. In case (a), the magnet falls
ID: 2040527 • Letter: A
Question
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
in case a, the magnet falls through the wire loop, and in case b, there is nothing between the ground and thebar magnet
now in case a, we observe that the magnet loses some KE before reachint eh ground and hence we see that the final speed of the bar magnet in case a is less than that of magnet in case 2
now since both fell from the same initial height
this means that the bar magnet in case 1 lost its energy somewhere
this is the energy which is used to induce current in the coil when the magnet moves through it
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