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Motional emf problem on inclined plane

  • Thread starter yankans
  • Start date
  • #1
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Homework Statement



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


Homework Equations



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


The Attempt at a Solution



I honestly have no idea where to start this problem...
 

Answers and Replies

  • #2
Astronuc
Staff Emeritus
Science Advisor
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1,720

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