1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

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
    and
    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

    Astronuc

    User Avatar
    Staff Emeritus
    Science Advisor

Share this great discussion with others via Reddit, Google+, Twitter, or Facebook




Loading...