Point charge moving in a magnetic field question

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Discussion Overview

The discussion revolves around a physics problem involving a proton moving in a uniform magnetic field. Participants are attempting to clarify the meaning of the magnetic field's orientation and the specifics of the problem, including the angle 'fi' and distance 'd' that need to be calculated.

Discussion Character

  • Homework-related
  • Conceptual clarification

Main Points Raised

  • One participant describes the magnetic field as directed "into the page," suggesting it corresponds to a z-axis orientation in a coordinate system.
  • Another participant expresses confusion about the question's requirements, specifically regarding what the angle 'fi' and distance 'd' refer to.
  • A third participant notes the need to calculate the force on the charge using the equation F = q V x B, indicating a focus on the underlying physics principles.

Areas of Agreement / Disagreement

Participants express varying levels of understanding regarding the problem's phrasing and requirements, indicating that the discussion remains unresolved with multiple interpretations of the question.

Contextual Notes

There is uncertainty regarding the definitions of the angle 'fi' and distance 'd,' as well as the implications of the magnetic field's orientation. The problem's specifics are not fully clarified, leading to potential gaps in understanding.

Matt Jacques
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"A proton with a speed 10^7 m/s enters a region of a uniform magnetic field B = .8 T, which is into the page. The angle is 60º Find the angle 'fi' and distance d"

"which is into the page."

What the heck does that mean!?
 
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The lines of magnetic force are conceived as running perpendicular to the page on which the diagram is drawn, and their direction is "into" rather than "out from" the page. So if everything in the plane diagram is referred to an x-y-coordinate system, the magnetic field will be directed along the z-axis.
 
I had a hunch it meant that, but why didnt it say z directly...anyway, how do I go about solving it?
 
Originally posted by Matt Jacques
... Find the angle 'fi' and distance d"
I don't understand the question. The angle and distance of what?

In any case, I'm sure you'll need to know how to find the force on that charge:

F = q V x B
 

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