Ch. 18 Homework, Phy 132, Spring 1998, Tulane

18.1   5*10^12 electrons

18.6   (a) 0.024 i N    (b) -0.024 i N

18.9   2.1*10^-5 i + 2.1*10^-5 j  N

18.11  (a) 999 i N/C    (b) -360 i N/C

18.13  (a) 3.45*10^4 i N/C    (b) 6.9*10^-5 i N

18.21  (a) 1.76*10^11 C/kg    (b) 1.76*10^13 m/s^2, opposite E-field
       (c) 1.71*10^-7 s       (d) 25.6 cm

18.29  (a) -1100 i - 1550 j  N/C    (b) 3.04*10^-16 N, along E-field

18.33  (a) -6.4 mm    (b) 17.7 degree down    (c) -4.48 cm

18.40  2.41 * kQq/R^2 i

18.43  (a) +q0, unstable along x, stable along y
       (b) -q0, stable along x, unstable along y
       (c) -q/4    (d) unstable system