QUESTION 8 An unknown point charge Q is placed 1.66 m from a proton. The proton then starts to accelerate at 9.63 m/s2 away from Q. What is the electric field E at the proton's initial position (in N/C; use positive sign if E points toward Q, and negative sign if E points away from Q)?QUESTION 9 A point electric charge of mass m = 1.21E-10 kg and charge q = 79.81E-l4 C is between a parallel plates as sketched. The acceleration due to gravity points down towards the z direction as shown. You want to apply a uniform electric eld E between the plates so that the electrical force cancels out the force of gravity acting on the charge, so the charge \"oats\" between the plates. What is the electric eld E (in N/C; use positive sign if E points in the +2 direction, and negative sign if E points in the z direction)? I | .X' QUESTION 10 Two point charges Q1 and Q2 are 8.40 in apart. The charge of Q1 is 3.7lE-9 C. The electric eld at the middle point between Q1 and Q2 is measured to be zero. What is the charge of Q2 (in Coulomb)? QUESTION 11 On the x axis, a point charge Q is placed at the origin x = 0.00 m. The electric eld at x = 2.50 m is measured to be 6.77E-3 N/C in the ex direction. What is the electric eld E at x = 71.00 in (in N/C; use positive sign if E points in the +x direction, and negative sign if E points in the x direction)