1989 Physics B Electro - Question #2.

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To determine the coordinate of point R on the x-axis where the electric potential is zero between two point charges, Q1 and Q2, the relevant equations for electric potential must be applied. The electric potential due to a point charge is given by V = k * q / r, where k is Coulomb's constant, q is the charge, and r is the distance from the charge. The total potential at point R is the sum of the potentials due to both charges, and it must equal zero for the desired point. The discussion highlights the need for clarification on which formulas to use for calculating the electric potential at a specific distance from each charge. Understanding these principles is essential for solving the problem effectively.
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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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