Answer Happy

I keep getting 3 and 4 wrong. The other answers are correct
Potential Energy of Point Charges A point charge 92 = -4.6 UC is fixed at the origin of a co-ordinate system as shown. Another point charge q = 0.5C is is initially located at point P, a distance d. = 7.2 cm from the origin along the x-axis R 92 de ....... ........ 1) What is APE, the change in potenial energy of charge 9, when it is moved from point P to point R, located a distance dz = 2.9 cm from the origin along the x-axis as shown - 417 Submit The charge 42 is now replaced by two charges 9 and 4 which each have a magnitude of -2.3 C, half of that of 92. The charges are located a distance a = 1.7 cm from the oringin along the y-axis as shown. What is APE, the change in potential energy now if charge 4, is moved from point P to point R? - 328 Submit 94 What is the potential energy of the system composed of the three charges 41, 42, and 4 when q, is at point R? Define the potential energy to be zero at infinity. 447 Submit Your submissions: 447 Computed value: 447 Feedback: X Submitted: Tuesday, February 4 at 10:56 PM The charge 44 is now replaced by charge 95 which has the same magnitude, but opposite sign from 44 (i.e., 45 = 2.3 C). What is the new value for the potential energy of the system? Submit Your submissions: OLX Computed value: 0 Submitted: Tuesday, February 11 at 3:49 AM Feedback: 5) d 91 96 Charges 9 and 95 are now replaced by two charges, 42 and 4, having equal magnitude and sign (-4.6°C). Charge 42 is located at the origin and charge qc is located a distance d = d. + d = 10.1cm from the origin as shown. What is APE, the change in potential energy now if charge q, is moved from point P to point R2 Submit