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540x10^-2=5.40 A/m^2

5.40= .9/x

Solving for x gives the answer: .166666666666667

Then:

.166666666667=pi(r^2)

sqrt(.166666666667/pi)=r

The result of that answer multiplied by 2 gives 4.607m. The answer asks for it in mm so I converted to 460.7mm and it says its wrong. Where did I go wrong, I'm just using the current density formula: J=I/A

Where J is the current density

I is the current

A is the area