Electric Force and Electric Field
Electric Force and Electric Field
Electric Force and Electric Field
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advantageoRFigure 1Here R is a unit vector directed along the line connecting the two point charges. The forcelaw, known as Coulomb's law, also describes the force between two spherical charges whereR is the distance between the centers of the two charges.Three charges are arranged along the x-axis: +3 fiC at the origin, —2 /iC atx = —2 m, <strong>and</strong> —4 /iC at x = +3 m. Find the net force on the charge at theorigin (figure 2).(-2,0) (0,0) (3,0)-4fiCF_ 2-»3F-4+3Figure 2The +3 juC charge will experience a force in the —x direction due to the — 2//C.The magnitude of this force is= 9 X_ l37 x 10-2The +3/*C charge will experience a force in the +x direction due to the — AftC.The magnitude of this force is= 9 XThe net force will point in the —x direction <strong>and</strong> have a magnitude equal tothe difference of the two contributions.netF= 1.5 X 10"3NChapter 10