QUIZ XII COULOMB S LAW and SUPERPOSITION Consider the following charge distribution a b Determine the net ELECTROSTATIC FORCE magnitude and direction on a charge e located at 0 0 7 Repeat assuming the charges at s 0 and s 0 are 2e rather than 2e 3 SOLUTION KEY CONCEPTS RELATIONSHIPS LAWS SOURCE CHARGES TEST CHARGE COULOMB s LAW The SUPERPOSITION THEOREM a b Denote SOURCE CHARGES Q1 2e at s 0 Q2 e at 0 s Q3 2e at s 0 then By Superposition F0 F1 0 F2 0 F3 0 where F1 0 k 2e2 s2 ux F2 0 ke2 s2 uy and F3 0 k 2e2 s2 ux yielding F0 ke2 s2 uy 2 56x10 9 N uy Denote SOURCE CHARGES Q1 2e at s 0 Q2 e at 0 s Q3 2e at s 0 then Again by Superposition F0 F1 0 F2 0 F3 0 where F1 0 k 2e2 s2 ux F2 0 ke2 s2 uy and F3 0 k 2e2 s2 ux yielding F0 ke2 s2 uy 2 56x10 9 N uy
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