Solve Electric Field Problem: Find q1 and q2

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Homework Help Overview

The discussion revolves around calculating the values of two point charges, q1 and q2, based on the provided conditions of their arrangement and the behavior of a third charge influenced by them. The subject area is electrostatics, specifically focusing on electric fields and forces between point charges.

Discussion Character

  • Exploratory, Assumption checking, Problem interpretation

Approaches and Questions Raised

  • Participants discuss the initial conditions of the problem, including the placement of the charges and the resulting acceleration of the third charge. There are questions regarding the accuracy of angles used in calculations and the values of mass and charge units.

Discussion Status

The discussion is ongoing, with participants providing feedback on each other's calculations and assumptions. Some guidance has been offered regarding the interpretation of angles and the importance of consistent units, but no consensus has been reached on the correct approach to finding q1 and q2.

Contextual Notes

Participants note discrepancies in the values used for mass and charge units, as well as the angle measurements, which may affect the calculations. The original poster mentions a figure that is referenced but not included in the discussion.

NickPA
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Two point charges q1 and q2 are held in place 4.50 cm apart. Another point charge -1.75 mC of mass 4.50 g is initially located 3.00 cm from each of these charges (the figure ) and released from rest. You observe that the initial acceleration of -1.75 mC is 324 m/s^2 upward, parallel to the line connecting the two point charges

Find q1 and q2 ?

I attached a pic of my work.
 

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Hello NickPA. Welcome to PF!

Your method of solution looks good. But I don't agree with your value of the angle ø. Also, in the problem statement the mass is given as 4.50 g whereas in your calculation you use 5.00 g. In the statement of the problem, Q is given in mC whereas in your calculation you use μC.
 
it is supposed to be 5 g. Bad copy and paste sorry. That seems to be the difference between my answer and the right answer. They (the book authors) are using cos, while i used sin, but should it not work?
 
I don't see how you got 41.3 degrees for the angle ##\phi## shown in your figure. Can you show your work here?
 

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