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Solve for e: (E/e)=(R+r)/r)
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Solve for e: (E/e)=(R+r)/r)

User Sultan Ahmed
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(E)/(e)=(R+r)/(r)\Rightarrow(e)/(E)=(r)/(R+r)\qquad|\text{multiply both sides by}\ E\\eq0\\\\\boxed{e=(rE)/(R+r)}

User Tayyab Amin
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