일반물리학 2 — Electric Fields: Problem 32

32 In Fig. 22-38, the four particles are fixed in place and have charges \( q_1 = q_2 = +5e \), \( q_3 = +3e \), and \( q_4 = -12e \). Distance \( d = 8.0 \text{ }\mu\text{m} \). What is the magnitude of the net electric field at point \( P \) due to the particles?