Explain every little step you do or thumbs down. I need an explanation for every tiny step and wh...

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Explain every little step you do or thumbs down. I need an explanation for every tiny step and why you are using this step for this part of the question. state the equations you are using and double check your answer.

#3) The charge in the figure on the x-axis is moved gradually from x = 0 to x = 5m. At what value of x will the electrostatic force on this charge be a maximum and a minimum? What is the maximum force? What is the minimum electrostatic force? (17cm, 3.2E-19C, 6.4E-19C)

#4) Figure 21-41 shows a long, nonconducting, massless rod of length L, pivoted at its center and balanced with a block and weight W at a distance x from the left end. At the left and right ends of the rod are attached small conducting spheres with positive charges q and 2q, respectively. A distance h directly beneath each of these spheres is a fixed sphere with positive charge Q. (a) Find the distance x when the rod is horizontal and balanced. (b) what value should h have so that the rod exerts no vertical force on the bearing when the rod is horizontal and balanced?