1989 Physics B Electro - Question #2.

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SUMMARY

The discussion centers on determining the coordinate of point R on the x-axis between two point charges, Q1 and Q2, where the electric potential is zero. Charge Q1 is +8.0 x 10^-6 C and is positioned at 0 meters, while charge Q2 is -2.0 x 10^-6 C and is located at 0.20 meters. The net electric field is zero at point P, which is 0.40 meters from Q1. To find point R, the formula for electric potential due to a point charge must be applied, specifically V = k * q / r, where k is Coulomb's constant, q is the charge, and r is the distance from the charge to point R.

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  • Familiarity with point charges and their configurations
  • Knowledge of basic algebra for solving equations
  • Concept of electric fields and their relation to potential
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Homework Statement


Two point charges, Q1 and Q2, are located a distance 0.20 meter apart, as shown above. Charge Q1 = +8.0*10^-6C. The net electric field is zero at point P, located 0.40 meter from Q1 and 0.20 meter from Q2. Charge Q2 = -2.0*10^-6C.

Determine the coordinate of the point R on the x-axis between the two charges at which the electric potential is zero.

Homework Equations



There is an x-axis in which Q1 is located at 0, Q2 is located at 0.2, and P is located at 0.4 (all in meters).

The Attempt at a Solution



I can't figure out what formula to use in order to find the location... what should I use?
 
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