Simple magnetic field circular motion problem

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Homework Help Overview

The discussion revolves around the motion of protons in a magnetic field, specifically examining whether the motion is circular or helical based on the angle of velocity relative to the magnetic field direction.

Discussion Character

  • Conceptual clarification, Assumption checking

Approaches and Questions Raised

  • Participants explore the relationship between the angle of the proton's velocity and the orientation of the magnetic field, questioning the implications of a 30-degree angle on the nature of the motion.

Discussion Status

There is an ongoing exploration of the conditions under which the motion is classified as circular or helical, with participants questioning the significance of the angle of velocity in relation to the magnetic field.

Contextual Notes

Participants are considering the implications of the angle of velocity being 30 degrees from the +x-axis and its relationship to the magnetic field oriented in the +z-axis.

letsgo
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There's basically a beam of protons moving in the x-y plane, 30 degree from the +x-axis. The magnetic field is oriented in the +z-axis. So would the particle's motion be circular or helical?

I say helical, because the velocity isn't completely perpendicular.
Is this correct?
 
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If the velocity is not perpendicular to the field, what angle to you think it makes, and why?
 
Okay, is it 90? So then it means it is circular? Since even though its 30 degrees from the x-axis, its still perpendicular to the B-field?
 
letsgo said:
Okay, is it 90? So then it means it is circular? Since even though its 30 degrees from the x-axis, its still perpendicular to the B-field?
Yes, it should describe a circle in the XY plane.
 

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