How Do You Calculate the Unknown Charge in an Electrostatic Field?

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Homework Help Overview

The discussion revolves around calculating an unknown charge in an electrostatic field, specifically involving two charges: one unknown and another known charge of 60 nC, separated by a distance of 2.0 m. The electric field strength is noted to be zero at a specific point along the line connecting the two charges.

Discussion Character

  • Exploratory, Conceptual clarification, Problem interpretation

Approaches and Questions Raised

  • The original poster attempts to formulate an equation based on the provided information but expresses uncertainty about its effectiveness. Other participants inquire about the equations governing electric fields with multiple charges and the method for determining the force on a third charge in the system.

Discussion Status

The discussion is ongoing, with participants seeking clarification on the relevant equations and concepts. There is an indication that guidance may be needed to navigate the problem effectively, but no consensus or resolution has been reached yet.

Contextual Notes

Participants are exploring the implications of having two charges in the system and how that affects the calculations for electric fields and forces. There may be assumptions regarding the setup that are being questioned, but these remain unaddressed.

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Homework Statement



An unknown charge and a charge of 60 nC are 2.0m apart. The electric field strength is zero at a point 0.80m from the unknown charge on a line connecting the two charges. Find the magnitutde of the unknown charge.

Homework Equations


q=F/E
F=kq1q1/r^2
E=kq/r^2

Coulomb constant: 8.99 x10^9


The Attempt at a Solution


I tried making an equation with the info given, but it doesn't seem like it's going to help me:
0=(8.99x10^9)(x)/(0.8)^2

i think i just need a push in the right direction
 
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anyone?
 
What is the equation of an electric field with 2 charges present?
 
JHamm said:
What is the equation of an electric field with 2 charges present?

uhh?
force?
 
If the system has 2 charges how do you find the force on a third charge at a point? :)
 

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