Solve the equation for the indicated variable. (Leave \pm in the answer as needed.) \[ J=\frac{d A}{n^{2}} \text { for } n \] $\mathrm{n}=\square$ (Rationalize all denominators.)

Step 1 ：Multiply both sides of the equation by \(n^{2}\) to get \(Jn^{2}=dA\).

Step 2 ：Divide both sides of the equation by \(J\) to get \(n^{2}=\frac{dA}{J}\).

Step 3 ：Take the square root of both sides of the equation to solve for \(n\).

Step 4 ：Final Answer: \(n=\boxed{\pm \sqrt{\frac{d A}{J}}}\)