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A small charged plastic ball of mass (m) is suspended by a string of length (L) in a uniform electric eld (E), as shown in the Figure. The ball is in equilibrium when the string makes a {0) angle with the vertical as indicated. Assume the charge on the ball is (q). a a) [10%] How many total force onto the ball? a b] [10%] What is the tension force direction of the string onto the ball? a c) [10%] What is the electric force direction onto the ball? a d) [35%] Write the equation when the ball is under equilibrium in the horizontal direction: a e) [35%] Write the equation when the ball is under equilibrium in the vertical direction: A rod 2.45 m long is uniformly charged and has a total charge of 2.68 uC. Determine the Q P magnitude of the total electric field (unit in N/C) along the axis of the rod at a point 7.57 m from its center.R A uniformly charged disk of radius 15.9 cm carries charge with a density of 2.14 x10(-9) P C/m2. Calculate the magnitude of total electric 4 - - -- field (unit in N/C) on the axis of the disk at 10.6 X cm from the center of the disk.A uniformly charged insulating semicircle-rod with radius of R is shown in Figure. The rod has a total positive charge of Q. Find the magnitude and O direction of the electric field at O, the center of the semicircle