Answer
$d = \sqrt\frac{kP_{1}P_{2}}{C}$
Work Step by Step
$C = \frac{kP_{1}P_{2}}{d^2}$. Solve for $d$.
$Cd^2 = kP_{1}P_{2}$
$d^2 = \frac{kP_{1}P_{2}}{C}$
$d = \sqrt\frac{kP_{1}P_{2}}{C}$
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