Two Charges, Find Spot of Zero Potential

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SUMMARY

The discussion focuses on determining the distance L from a negative charge (-q) to a point where the total electric potential is zero, given a positive charge (+2q) located 6.00 meters away. The equation used is Vtotal = kq1/r1 + kq2/r2, where the user attempts to set Vtotal to zero and solve for the distances r1 and r2. The user is advised to utilize the properties of right triangles to express r1 in terms of r2, facilitating the solution of the problem.

PREREQUISITES
  • Understanding of electric potential and the formula V = kq/r
  • Knowledge of basic geometry, particularly right triangles
  • Familiarity with the concept of electric charges and their interactions
  • Ability to manipulate algebraic equations
NEXT STEPS
  • Study the principles of electric potential and equipotential surfaces
  • Learn about the geometry of right triangles in physics problems
  • Explore the concept of superposition in electric fields
  • Practice solving problems involving multiple charges and their potentials
USEFUL FOR

Students studying electrostatics, physics educators, and anyone seeking to understand electric potential in systems with multiple charges.

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Homework Statement



Charges of -q and +2q are fixed in place, with a distance d = 6.00 m between them. A dashed line is drawn through the negative charge, perpendicular to the line between the charges. On the dashed line, at a distance L from the negative charge, there is at least one spot where the total potential is zero. Find the distance L.
http://edugen.wiley.com/edugen/courses/crs1507/art/qb/qu/c19/qu_19.62.gif

Homework Equations



Vtotal = kq1/r1 + kq2/r2

The Attempt at a Solution



Since I'm looking for when vtotal = 0 then -kq/r1 = k2q/r2

I'm lost as to where to go from here, I can't figure out how to use the d=6m. Any help is appreciated!
 
Physics news on Phys.org
so find r1 in terms of r2

trhen make use fo the fact that r1, r2 & d make a right triangle
 

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