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A solenoid is wound with 220 turns on a form 4 cm in diameter and 50 cm long. The windings carry a current in the sense that is shown.

A solenoid is wound with 220 turns on a form 4 cm in diameter and 50 cm long. The windings carry a current in the sense that is shown. The current produces a magnetic field, of magnitude at the center of the solenoid. In the figure, the current in the solenoid windings is closest to:


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