[tex]2Ep=Ek\\2Ep=Ec-Ep\\3Ep=Ec\\3*\frac{kx^{2} }{2}=\frac{kA^{2} }{2} /*2\\3kx^{2} =kA^{2} \\x^2=\frac{kA^{2} }{3k} \\x=\sqrt{\frac{A^2}{3} } =\sqrt{\frac{3^{2} }{3} } =1.73cm[/tex]
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[tex]2Ep=Ek\\2Ep=Ec-Ep\\3Ep=Ec\\3*\frac{kx^{2} }{2}=\frac{kA^{2} }{2} /*2\\3kx^{2} =kA^{2} \\x^2=\frac{kA^{2} }{3k} \\x=\sqrt{\frac{A^2}{3} } =\sqrt{\frac{3^{2} }{3} } =1.73cm[/tex]