Question: You have a 1.0-m-long copper wire. You want to make an N turn current loop that generates a 1.0 mT magnetic field at the center

You have a 1.0-m-long copper wire. You want to make an N turn current loop that generates a 1.0 mT magnetic field at the center when the current is 1.0 A. You must use the entire wire.
What will be the diameter of your coil?

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