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    • https://phys.libretexts.org/Courses/Georgia_State_University/GSU-TM-Introductory_Physics_II_(1112)/03%3A_Electric_Charge_and_Electric_Field/3.10%3A_Practice
      26. (a) What is the direction of the total Coulomb force on q in Figure if q is negative, qa=qc and both are negative, and qb=qc and both are positive? (b) What is the dir...26. (a) What is the direction of the total Coulomb force on q in Figure if q is negative, qa=qc and both are negative, and qb=qc and both are positive? (b) What is the direction of the electric field at the center of the square in this situation? 82. (a) What is the electric field 5.00 m from the center of the terminal of a Van de Graaff with a 3.00 mC charge, noting that the field is equivalent to that of a point charge at the center of the terminal?

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