NTNUJAVA Virtual Physics Laboratory
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Author Topic: Shape of charged beam due to deviation in angle/velocity  (Read 11102 times)
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Fu-Kwun Hwang
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on: February 13, 2010, 04:48:01 pm » posted from:Taipei,T\'ai-pei,Taiwan

A charge q with velocity v enter into a region with perpendular to magnetic field B, will move in a circular orbit.
The trajectory of the beam will spread out if the bean is deviated with a small angle \theta (dca in the simulation) or with small deviation in velocity (dv)

The angle \theta = dca * (random() -0.5); // where random() give random number between 0-1
The velocity v=V+ dv* (random() -0.5);

The trjjectory for all different possible paths are shown in the following simulation.

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* chargeinBvdc.gif (2.05 KB, 402x405 - viewed 311 times.)
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Reply #1 on: February 26, 2010, 01:04:55 am » posted from:Yogyakarta,Yogyakarta,Indonesia

may we change for the point random .. it means become positive ..
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Fu-Kwun Hwang
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Reply #2 on: February 26, 2010, 10:29:26 am » posted from:Taipei,T\'ai-pei,Taiwan

The above simulation assume the beam enter into the magnetic field vertically (but there is a small angle deviation).
I think what you mean is that the beam might enter into the field with a angle.
The code has been updated, so that you can change the incident angle with slider c, or drag the red arrow to change it direction directly.

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  • Please feel free to post your ideas about how to use the simulation for better teaching and learning.
  • Post questions to be asked to help students to think, to explore.
  • Upload worksheets as attached files to share with more users.
Let's work together. We can help more users understand physics conceptually and enjoy the fun of learning physics!
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