Zag Solenoid: Using Magnetic Field Force Formula

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  • Thread starter Thread starter Ziggey
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    Building Solenoid
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Discussion Overview

The discussion revolves around the application of the magnetic field force formula, specifically in the context of a solenoid. Participants explore the calculations related to the magnetic field generated by the solenoid and seek clarification on the components of the Lorentz force formula.

Discussion Character

  • Exploratory, Technical explanation, Conceptual clarification

Main Points Raised

  • One participant presents the magnetic field force formula F = qv (dot) B and seeks guidance on its application with a solenoid's magnetic field.
  • Another participant requests clarification on a picture that contains relevant information, indicating difficulty in reading it.
  • A participant shares their calculations for the magnetic field using the formula B = unI, providing specific values for n and u, and asks for validation of their results.
  • One participant confirms the calculations appear correct and clarifies that the magnetic field force formula is actually the Lorentz force formula, F = q (v × B).
  • A participant expresses confusion regarding the velocity component in the Lorentz force formula, questioning whether it refers to the speed of an electron.
  • Another participant confirms that the velocity refers to the electron's speed and provides a link for further reading.
  • The original poster expresses intent to work through the problem and share their findings for further assistance.

Areas of Agreement / Disagreement

Participants generally agree on the calculations presented, but there is uncertainty regarding the interpretation of the velocity component in the Lorentz force formula. The discussion remains unresolved in terms of fully clarifying this aspect.

Contextual Notes

Participants have made assumptions regarding the values used in calculations, and there is a lack of consensus on the interpretation of the velocity in the Lorentz force formula.

Ziggey
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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
 
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It's really hard to read the text in the picture. Can you summarize by posting it?
 
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?
 
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})##
 
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?
 
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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