You need to make a 115 µH inductor on a cylinder that is 5.0 centimeter long and 1.0 centimeter in diameter. You plan to wrap four layers of wire around the cylinder. Determine what diameter wire should you use if the coils are tightly wound with no space between them? The wire diameter is small enough you do not need to consider the change in the coil's diameter for the outer layers.
Answer = _______________ mm