Answers for Practice Test #2

• [1] (a) J1 > J2
  (b) E1 > E2
  (c) V1 > V2
• [2] Q = 66.8 C
• [3] (a) point a is at higher electicpotential (proton accelerates from a to b, which means that kinetic energy increases, and therefore potential energy decreases)
  (b) delta V = -3.425 x 10⁴V
• [4] Q₃ = 27x10^-C and V₃ = 2.25V
• [5] V = 1.25 V
• [6] B is an insulator and C is a conductor
• [7]

  (c) E1 = -(40V-80V)/(1.5m - 0.5m) = +40 V/m
  E9 = -(-60V-(-40V))/(10m - 6m) = +5 V/m

• [8] (you worked this problem in class)
  (a) D = E > A > F = G > B = C
  (b) If C is removed, then B goes out and E gets dimmer