How Does a Proton Move in a Magnetic Field?

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SUMMARY

A proton moving in a uniform magnetic field of strength B experiences a force defined by the equation F=qvB, which leads to circular motion. The period of this motion is calculated using the formula T=2πm/qB, where m is the mass of the proton and q is its charge. When entering the magnetic field from a non-magnetic region, the proton will spend half of its period within the field. This understanding is crucial for accurately determining the time spent in the magnetic field.

PREREQUISITES
  • Understanding of magnetic fields and forces on charged particles
  • Familiarity with the equations of motion in physics
  • Knowledge of the properties of protons, including mass and charge
  • Basic calculus for deriving expressions related to motion
NEXT STEPS
  • Research the Lorentz force and its implications for charged particles
  • Learn about the motion of charged particles in electric and magnetic fields
  • Explore the concept of cyclotron motion and its applications
  • Study the derivation and applications of the right-hand rule in magnetic fields
USEFUL FOR

Students studying physics, particularly those focusing on electromagnetism, as well as educators seeking to enhance their understanding of particle motion in magnetic fields.

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Homework Statement

A proton enters a uniform magnetic field of strength B. Sketch it subsequent motion and derive an expression for the time, t, spent in the magnetic field.

Homework Equations



F=qvB=mv^{2}\div r

The Attempt at a Solution



I calculated the period of the particle in the field as:

T= 2 \pi m\div qB

I don't know if this is what they want or if there's a way to calculate the total time.
 
Last edited:
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A delayed reply, but this one looks like just what you had asked.

http://regentsprep.org/Regents/physics/phys03/cdeflecte/default.htm
 
Last edited by a moderator:
A charged particle will spend 1/2 period in a magnetic field (assuming it's constant) when it enters at the boundary from a region without the magnetic field.
 

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