We are now in a position to treat the example in Sect. 8.2.1 quantitatively. Suppose q₁ is at x₁ = −vt and q₂ is at y = −vt (Fig. 8.3, with t 0). Find the electric and magnetic forces on q₁ and q₂. Is Newton’s third law obeyed?

Figure 8.3

      

Fe ya 92 V2 - B -Fm B m 91 FIGURE 8.3 Fe X