(a) If the charge on particle 2 in Exercise 23.1 is doubled so that \(q_{2}=2 q_{1}\), what happens to the direction of the electric field at points \(P_{1}\) through \(P_{4}\) ?

(b) If the charge on particle 2 is negative so that \(q_{2}=-q_{1}\), what is the direction of the electric field at points \(\mathrm{P}_{1}\) through \(\mathrm{P}_{4}\) ?

Data from Exercises 23.1

Consider two identical particles 1 and 2 carrying charges \(q_{1}=q_{2}>0\) (Figure 23.10). What is the direction of the combined electric field at points \(\mathrm{P}_{1}\) through \(\mathrm{P}_{4}\) ?

Figure 23.10 P P3 P + 91 P + 92