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Homework Help: Motional emf problem on inclined plane

  1. Apr 16, 2009 #1
    1. The problem statement, all variables and given/known data

    a straight horizontal rod slides along parallel conducting rails at an angle with the horizontal of 30 degrees (inclined plane). The rails are connected at the bottom by a horizontal rail so that the rod and rails form a closed rectangular loop. A uniform vertical field exists throughout the region.
    assume: rod remains in contact w/ rails as it slides down rails. rod experiences no friction/air drag. Rails and rod have negligible resistance. g = 9.8m/s^2.
    a)if velocity of the rod is 4.6m/s, what is the current through the resistor? answer in mA.
    b) what is the terminal velocity of the rod? (in m/s)

    note: this is like a motional emf problem - the rod on rails
    rod = 71 g in mass, moving at 4.6m/s
    magnetic field = 0.16 straight down
    resistor = 6.8 ohms

    2. Relevant equations

    F magnetic field = IBl where l is lowercase L, the width btwn rails
    Emf = Blv
    magnetic flux = Blx

    3. The attempt at a solution

    I honestly have no idea where to start this problem...
  2. jcsd
  3. Apr 17, 2009 #2


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