6. The electric potential difference between two large parallel plates is 100 V. The plates are 5.0 cm apart. What is the electric field between them? (2 marks, K) 7. Three charges sit on the vertices of an equilateral triangle, whose sides equal 1.0 m. Each charge is +1.0 uC. Find the force on charge C. Draw a free-body diagram for charge C. (4/1 marks, A/C) C 8. A small ball of charge 1.0 uC and mass 1.0 g is released from a point whose potential is 43 V, and allowed to move to another point whose potential is 28 V. What is the speed of the ball at the second point? (3 marks, T) 9. Two identical point charges, +1.0 uC each, are separated by 2.0 m. Calculate the electric field and the electric potential at point P, midway between them. [3 marks, A)