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Homework Help: Induced current in 2 cases

  1. Jul 25, 2012 #1
    1. The problem statement, all variables and given/known data
    http://img831.imageshack.us/img831/9721/img20120725160304.jpg [Broken]
    http://img542.imageshack.us/img542/653/img20120725160312.jpg [Broken]
    Fig 1 is an AC generator
    Fig 2 shows 2 solenoids
    (ASSUME the area of coils in both fig1 and 2 are the same = A, resistance of 3-turn coils = R)
    Is there any difference in the magnitude of the average current induced in 0.1s ?
    What will be the change in current if I raise the no. of turns of coils from 3turns to 6 turns in both the AC generator and the right-side solenoid ?

    The current should be the same in both figures, but in fig2 the current is halved if i apply conservation of energy.
    2. Relevant equations
    (3AB/0.1)/R = induced current in both setups
    (6AB/0.1)/2R = induced current in both setups after winding 3 more turns

    However, the actual induced current in fig2 i calculated is wrong. I should consider the conservation of energy. But isn't Fig1 and 2 are the same ? Can't I use the same method to do it ?
    3. The attempt at a solution
    1. The problem statement, all variables and given/known data

    2. Relevant equations

    3. The attempt at a solution
    Last edited by a moderator: May 6, 2017
  2. jcsd
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