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co х Questions 1-5 (-2,3) (2,3) Three point charges are placed at the following (x,y) coordinates: charge qı = 9nC at A 10 (-2m,0), charge q2 = 5 nC at (2m,0), and charge Q= -8 nC at (2m, 3m). Take the zero of potential to be at infinity. (Unit prefix n stands for nano = 10-º, î and j are 9 92 unit vectors pointing in positive x and y axes respectively). (-2,0) (2,0) 1. Which of the following is the electrical force that Q exerts on q2 in nN units? (a) 72 nNî (b) 1209 (c) – 40j (d) 40j (e) – 120j 2. What is the electrical potential at point A(-2m, 3 m) due to these three point charges? (a) 9V (b) 54V (c) 15.3V (2) 18V (e) 6.3V 3. Which of the following is the electric field in units of V/m at point A(-2m, 3m) due to the charges qi and Q only? (a) -4.5i +9] (b) 4.5i - 6j (c) 4.5i +91 (d) 9i+61 (e) -9+9j 4. What is the potential at the (2 m,3 m) position of charge Q due to the charges qı and qz? (a) 72V (b) –57.4V (c) -18V (d) 14.4V (e) -31.2 V 5. How much work is required to take the charge Q to infinity? (a) 249.6) (b) 115.2 (c) 144.J (d) 58.6J (e) -576)