Chapter 21, Problem 29P

GO In Fig. 21-33, particles 2 and 4, of charge −e, are fixed in place on a y axis, at y₂ = −10.0 cm and y₄ = 5.00 cm. Particles 1 and 3, of charge −e, can be moved along the x axis. Particle 5, of charge +e, is fixed at the origin. Initially particle 1 is at x₁ = −10.0 cm and particle 3 is at x₃ = 10.0 cm. (a) To what x value must particle 1 be moved to rotate the direction of the net electric force ${\stackrel{\to }{F}}_{\text{net}}$ on particle 5 by 3° counterclockwise? (b) With particle 1 fixed at its new position, to what x value must you move particle 3 to rotate ${\stackrel{\to }{F}}_{\text{net}}$ back to its original direction?

Figure 21-33 Problem 29.