Building a solenoid

  • Thread starter Ziggey
  • Start date
  • #1
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Main Question or Discussion Point

Hello so I just want to make sure I Am doing this correctly.
ImageUploadedByPhysics Forums1405535637.088417.jpg
also I know there is a magnetic field force formula. That is F= qv (dot) B
How would I go about using that formula with the magnetic field I created from the solenoid in the picture?

Thanks for any help!
Zig
 

Answers and Replies

  • #2
Matterwave
Science Advisor
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It's really hard to read the text in the picture. Can you summarize by posting it?
 
  • #3
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Ok I'm using the equation B= unI
n=N/L
u=k(4*pie*10^-7)
k=200

Once I plug in the numbers I get n= 18/.504=35.7142, u= 2.513*10^-4.
So if I have 10 amps then my final number should be .0897 B. Did I do that correct?
 
  • #4
PhysicoRaj
Gold Member
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For the values you have assumed, the calculations seem correct. About the magnetic field force formula, you are referring to Lorentz force formula:##F=q (\vec{v}\times\vec{B})##
 
  • #5
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Ok well what I don't understand about that equation is the velocity part. I have been trying to do some reading on it, but I don't understand it. Is the velocity for the speed of the electron or something else?
 
  • #7
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Ok I will try and get it then show my work to make sure I'm doing it correctly. Thank you for the help!! Zig
 

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