Find The Angle of The Electron; Motion of Charges

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Homework Help Overview

The discussion revolves around determining the angle at which electrons exit a uniform electric field created by parallel plates. The problem involves understanding the motion of charges within an electric field, specifically focusing on the forces acting on an electron and its resulting trajectory.

Discussion Character

  • Exploratory, Conceptual clarification, Assumption checking

Approaches and Questions Raised

  • The original poster attempts to calculate the exit angle of the electron using its position on the y-axis and the tangent of the x and y values. They express uncertainty about their results and mention a specific equation related to the motion of the electron. Other participants question the forces acting on the electron and seek clarification on the orientation of the electric field and plates.

Discussion Status

The discussion is ongoing, with participants exploring the forces acting on the electron and the implications of the electric field's orientation. Clarifications about the setup are being sought, and there is a focus on understanding the underlying physics rather than arriving at a definitive solution.

Contextual Notes

Participants are considering the implications of the electric field's orientation, which is described as negative on the bottom and positive on the top. There may be constraints related to the assumptions made about the electric field and the forces involved.

withthemotive
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At what angle will the electrons leave the uniform electric field at the end of the parallel plates? Assume the plates are 4.9 cm long and E = 5.0 x 10^3 N/C.

*The answer to this question is -23 degrees.

So far what I have tried to do is find the position of the electron on the y-axis and then take the tangent of the x&y values. My answers so far have been off. The closest I've gotten so far is -12 degrees.

This is the equation I used:

y = [(qE) / (2m(V)^2)] * (x)^2

q= -1.6x10^-19 C
m= 9.1x10^-31 kg
 
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Let's start again from the beginning.

What are the forces acting on the electron? Can you therefore determine the acceleration of the electron?

*Clarification: Does the question mention the orientation of the field/plates? Is the electric field directed vertically upwards/downwards or horizontally for example?
 
Yeah, the orientation of the plates is negative on bottom and positive on top.
 
withthemotive said:
Yeah, the orientation of the plates is negative on bottom and positive on top.
Okay, thanks.
Hootenanny said:
What are the forces acting on the electron? Can you therefore determine the acceleration of the electron?
 

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