Consider the arrangement of three point charges in a right triangle shown in the figure, which have charges q1 = 5.5 μC, q2 = -61 μC, and q3 = 35 μC. The distance between q1 and q2 is 39 cm and the distance between q2 and q3 is 78 cm. Part a How much potential energy, in joules, is stored in this configuration of charges?

Part A Two 3.0-cm-diameter disks face each other, 2.3 mm apart. They are charged to + 14 nC. What is the electric field strength between the disks? Express your answer with the appropriate units. > View Available Hint(s) HÁ E = Value Units %3D Submit Part B A proton is shot from the negative disk toward the positive disk. What launch speed must the proton have to just bare reach the positive disk? Express your answer with the appropriate units. • View Available Hint(s) HA Value Units = Submit

The electron gun in an old TV picture tube accelerates electrons between two parallel plates 1.3 cm apart with a 26 kV potential difference between them. The electrons enter through a small hole in the negative plate, accelerate, then exit through a small hole in the positive plate. Assume that the holes are small enough not to affect the electric field or potential. Part A What is the electric field strength between the plates? Express your answer to two significant figures and include the appropriate units. E = Submit Part B Vexit = μA Submit Value Request Answer With what speed does an electron exit the electron gun if its entry speed is close to zero? Note: The exit speed is so fast that we really need to use the theory of relativity to compute an accurate value. Your answer to part B is in the right range but a little too big. Express your answer to two significant figures and include the appropriate units. μA Value Units Request Answer wwwww wwwww ? Units ?

60.0 pJ of energy is stored in a 1.00 cm X 1.00 cm X 1.00 cm region of uniform electric field. Part A What is the electric field strength? Express your answer with the appropriate units. ► View Available Hint(s) E = LO μA Value Units