Magnetic fields

  • #1

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



[tex]F=qvB=mv^{2}\div r[/tex]

The Attempt at a Solution



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

[tex]T= 2 \pi m\div qB[/tex]

I don't know if this is what they want or if there's a way to calculate the total time.
 
Last edited:

Answers and Replies

  • #3
Astronuc
Staff Emeritus
Science Advisor
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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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