Question: 4. (14 points) Two source charges are located as shown in the figure. Point P is located 2 cm directly in the +y direction

4. (14 points) Two source charges are located as shown in the figure. Point P is located 2 cm directly in the +y direction from q as shown. Point P2 is above q, closer than 2 cm, but the exact distance is not known (and that is not needed). (a) What is the electric potential at the point P? Use the convention that the potential is 0 at infinity. (6 pts) .P 2.0 cm 9 =-4.0C 2.0 cm 2.0 cm (b) What work would an external force need to do in order to move a charge 93 = -3.0 nC from infinity to the point P? (4 pts) (c) If we were to move the charge q3 from P to P2, what would be the SIGN of the potential difference AV = VP2 - VP1, and the SIGN of the change in electric potential energy of the charge 93, AU = Up2 - Up? (4 pts) P 42 = 4.0/C

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