Electric field vector equation: Finding the neutral point for two charges

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SUMMARY

The discussion centers on determining the neutral point between two electric charges, specifically using the electric field vector equation. Participants debate the validity of writing the equation as E1 vector + E2 vector = 0 versus using magnitudes. The correct approach involves expressing the electric field at an arbitrary point P using unit vector notation and the formula $$\mathbf E(\mathbf r)=\frac{1}{4\pi\epsilon_0}\sum_{i=1}^2\frac{q_i(\mathbf r-\mathbf r'_i)}{|\mathbf r-\mathbf r'_i|^3}$$. The neutral point must lie along the line connecting the two charges, which simplifies the calculations.

PREREQUISITES
  • Understanding of electric field concepts and vector notation
  • Familiarity with Coulomb's law and electric field equations
  • Knowledge of unit vectors and their application in physics
  • Ability to solve equations involving multiple variables
NEXT STEPS
  • Study the derivation of electric field equations using Coulomb's law
  • Learn how to apply vector addition in the context of electric fields
  • Explore the concept of neutral points in electric fields with multiple charges
  • Investigate the graphical representation of electric fields and their interactions
USEFUL FOR

Students of physics, particularly those studying electromagnetism, educators explaining electric field concepts, and anyone involved in solving problems related to electric charges and fields.

  • #31
And what is the value of ##x## from that equation?
 
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  • #32
tellmesomething said:
Yes $$ \frac {kq} {x²}= \frac {k4q} {(√2-x)²} $$
I get x as ## \frac {√2} {3} ## @kuruman
 
  • #33
kuruman said:
And what is the value of ##x## from that equation?
Further I can multiply this with the unit vector and find the vevtor joining r2 and r3 as well as r3 and r1
 
  • #34
tellmesomething said:
Further I can multiply this with the unit vector and find the vevtor joining r2 and r3 as well as r3 and r1
And from there its easy to find out the position vector r3
 
  • #35
tellmesomething said:
And from there its easy to find out the position vector r3
Go ahead and do it.
 
  • #36
kuruman said:
Go ahead and do it.
Done! Got the answer.
 
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