"31 SSM ILW Www In Fig. 22-54, a nonconducting rod of length L = 8.15 cm has a charge -q = -4.23 fC uniformly distributed along its length. (a) What is the linear charge density of the rod? What are the (b) magni- tude and (c) direction (relative to the positive direction of the x axis) of the electric field produced at -9 Figure 22-54 Problem 31. point P, at distance a = 12.0 cm from the rod? What is the electric field magnitude produced at distance a=50 m by (d) the rod and (e) a particle of charge -q= -4.23 fC that we use to replace the rod? (At that distance, the rod "looks" like a particle.) y 60 Go In Fig. 21-43, six charged particles surround particle 7 at ra- dial distances of either d = 1.0 cm or 2d, as drawn. The charges are 91=+2e.q2=+4e.q3= +e.94 = +4e.qs = +2e.q6= +8e,q = +6e. with e=1.60 x 10-19 C. What is the magnitude of the net electro- static force on particle 7? 7 00 3 Figure 21-43 Problem 60.