Magnitude and Direction of Magnetic Field

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Homework Help Overview

The problem involves an electron moving in a magnetic field, where it experiences a force due to the field's influence. The context is centered around understanding the relationship between the force, charge, velocity, and magnetic field direction and magnitude.

Discussion Character

  • Exploratory, Conceptual clarification, Assumption checking

Approaches and Questions Raised

  • Participants discuss the formula for the magnetic force and its dependence on the charge, velocity, and magnetic field strength. Questions arise about the direction of the magnetic field relative to the force and the electron's motion. Some participants express uncertainty about visualizing the problem and creating a diagram.

Discussion Status

There is an ongoing exploration of the relationships between the variables involved. Some participants have suggested using the formula F = qvB and are considering the implications of the electron's negative charge on the direction of the magnetic field. Multiple interpretations of the field's direction are being discussed without a clear consensus.

Contextual Notes

Participants are grappling with the setup of the problem, including the need for a diagram and the implications of the electron's charge on the direction of the magnetic field. There is an acknowledgment of the perpendicular relationship between the force and the magnetic field.

thermocleanse
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Homework Statement


An electron experiences the greatest force as it travels 2.9 x 10^6 ms in a magnetic field when it is moving northward. The force is upward and of magnitude 7.2 x 10^-13 N. What are the magnitude and direction of the magnetic field?


Homework Equations





The Attempt at a Solution


I don't even know how to get a diagram going for this. Anything would be helpful. Thank you.
 
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What is the force exerted by a magnetic field of strength B, on a charge Q, moving at a velocity v?

F=?

When you get that it becomes simple algebra.

If the electron is moving northwards, what direction should the field be pointing?
 
I'm using F(max) = qvB because it seems that it's 90 degrees. The field should be 90 degrees relative to the upward force, so the field is perpendicular, or horizontal, right?

Also, because of the charge on the electron, i get a negative answer (in Tesla). does this mean that i indicate the negative charge as "eastward?"

please see attached. thank you!
 

Attachments

thermocleanse said:
I'm using F(max) = qvB because it seems that it's 90 degrees. The field should be 90 degrees relative to the upward force, so the field is perpendicular, or horizontal, right?

Also, because of the charge on the electron, i get a negative answer (in Tesla). does this mean that i indicate the negative charge as "eastward?"

please see attached. thank you!

I think if it is negative then your field should be pointing in the opposite direction that you took as the +ve direction.
 

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