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You have 3 objects: a long/ thin solenoid that is 1.50 meters long which contains 2.00...

You have 3 objects: a long/ thin solenoid that is 1.50 meters long which contains 2.00 × 10 4 loops of wire, a flat circular coil containing 3000 loops with a radius of 10.0 cm, and a flat circular coil containing 2000 loops with a radius of 20.0 cm. Which will produce the larger magnetic field at its center if you provide each with the same current?

There will be no difference.

The 20.0 cm coil

The solenoid

The 10.0 cm coil

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