일반물리학 2 — Electric Potential: Problem 32

32 In Fig. 24-37, how much work must we do to bring a particle, of charge $Q = +12e$ and initially at rest, along the dashed line from infinity to the indicated point near two fixed particles of charges $q_1 = +4e$ and $q_2 = -q_1/2$? Distance $d = 1.40 \text{ cm}$, $\theta_1 = 43^\circ$, and $\theta_2 = 60^\circ$.