Why Are My Calculations for Current in Moving Rods Using the Blv Rule Incorrect?

Join the discussion
Registration is free. Ask a follow-up in this thread, or start your own.
Sign up Log in
2 replies · 2K views
fizzyfiz
Messages
36
Reaction score
1
Homework Statement
The rod is moving on a second rod with speed of v in the magnetic field perpendicular to rod. I know its resistance per meter. I am expected to omit megnetic field created by the current and resistance at the point where rods touch each other and calculate current. I presented the situation with drawing ( the same as in task). My calculations occured to be wrong. Why?
Relevant Equations
I=Emf/R
Homework Statement: The rod is moving on a second rod with speed of v in the magnetic field perpendicular to rod. I know its resistance per meter. I am expected to omit megnetic field created by the current and resistance at the point where rods touch each other and calculate current. I presented the situation with drawing ( the same as in task). My calculations occurred to be wrong. Why?
Homework Equations: I=Emf/R

Emf=-dA/dt*B
 

Attachments

  • 20191010_120838.jpg
    20191010_120838.jpg
    35.7 KB · Views: 203
  • 20191010_120913.jpg
    20191010_120913.jpg
    30.7 KB · Views: 210
  • 20191010_120859.jpg
    20191010_120859.jpg
    45.8 KB · Views: 205
  • 20191010_120919.jpg
    20191010_120919.jpg
    29.9 KB · Views: 211
  • 20191010_120848.jpg
    20191010_120848.jpg
    34.4 KB · Views: 211

Discussion

Physics news on Phys.org
Check the area of the triangle as a function of time. Also, try using LaTeX for writing your equations instead of posting photos some of which are sideways.
 
Last edited:
In moving media such as your rod it's generally best to use the Blv rule rather than Faraday, although in this case it's OK to do so.