COS126

• Download FourChargeClient.java

/******************************************************************************\
 * Name:
 * NetID:
 * Precept:
 *
 * Description: Uses Charge.java to compute the electric potential at a point.
 *
 * Remark: This is Book Exercise 3.1.1.
\******************************************************************************/

public class FourChargeClient {
    public static void main(String[] args) {

        // read in distance r from command line
        double r = Double.parseDouble(args[0]);

        // center of standard drawing window
        double cx = 0.5;
        double cy = 0.5;

        // construct four charges
        Charge c1 = new Charge(cx + r, cy,     1.0);  // east
        Charge c2 = _______________________________;  // south
        Charge c3 = _______________________________;  // west
        Charge c4 = _______________________________;  // north

        // compute all four potentials at (0.25, 0.5)
        double px = 0.25;
        double py = 0.5;
        double v1 = c1.potentialAt(______________);
        double v2 = ______________________________;
        double v3 = ______________________________;
        double v4 = ______________________________;

        // compute and output total potential
        double sum =  ____________________________;                           
        StdOut.println("total potential = " + sum);
    }
}