Newton’s third law, as stated in words in many books, is that when one body exerts a force on a second body, the second body simultaneously exerts a force equal in magnitude and opposite in direction on the first body. In this appendix, we will examine it from the viewpoint of electric and magnetic forces [1,2,3].
It is easily shown to be valid in electrostatics by considering the vector form of Coulomb’s law between stationary charges Q1 and Q2. See Figure 13B.1 for an example of the satisfaction of Newton’s third law for the electric force.
FIGURE 13B.1Geometry to check the ...
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