What Is the Radius of a Proton's Helix in a Magnetic Field?

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SUMMARY

The radius of a proton's helical path in a magnetic field can be calculated using the formula r = (m * v * y * sin(α)) / (c0^2 * B). In this scenario, with a magnetic field strength B of 0.1 T, a proton mass of 938 MeV/c², a speed of 0.99c0, and an angle α of 60°, the relativistic factor y is calculated using y = 1 / √(1 - (v²/c0²)). The discussion highlights a misunderstanding regarding the use of relativistic effects and emphasizes the importance of applying the Lorentz force correctly in such calculations.

PREREQUISITES
  • Understanding of Lorentz force and its application in magnetic fields
  • Familiarity with relativistic equations, specifically y = 1 / √(1 - (v²/c0²))
  • Knowledge of the properties of protons, including mass in MeV/c²
  • Basic trigonometry to calculate the sine of angles in physics contexts
NEXT STEPS
  • Study the derivation and application of the Lorentz force in charged particle motion
  • Learn about relativistic momentum and energy concepts in particle physics
  • Explore the effects of magnetic fields on charged particles in different orientations
  • Research advanced topics in electromagnetism related to particle accelerators
USEFUL FOR

Physics students, educators, and professionals in fields related to particle physics and electromagnetism will benefit from this discussion, particularly those interested in the behavior of charged particles in magnetic fields.

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Homework Statement


Proton is moving in the homogen magentic field with B=0,1T. Mass of proton is 938MeV/c02.

How much is the radius of helix at which proton is moving, if his speed is 0,99*c0, and the angle between helix and magnetic field is 60°.

Homework Equations


y=[itex]\frac{1}{\sqrt{1-\frac{v^2}{c0^2}}}[/itex]

r=[itex]\frac{m*v*y*sin(α)}{c0^2*B}[/itex]

The Attempt at a Solution


I have tried to solve it in relativistic way whith equations that I wrote, but the result is wrong. What I am doing wrong?

I hope the post is ok and sory for potential mistakes in spelling and greetings from Slovenia.
 
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I don't understand where you got your equations.

Also, what do you mean "relativistic"? I don't think there should be any gammas anywhere in this calculation: all you use is the Lorentz force [itex]\vec{F}= q \vec{v} \times \vec{B}[/itex].
 

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