$(a)\;Q\;(E_{1}a + E_{2}b)\qquad(b)\;Q\;\sqrt{(E_{1} a)^2+(E_{2} b)^2}\qquad(c)\;Q\;(E_{1}+E_{2})\;\sqrt{a^2+b^2}\qquad(d)\;Q\;\sqrt{E_{1}^2+E_{2}^2}\;\sqrt{a^2+b^2}$

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