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A solenoid is 3.0 cm long and has a radius of 0.50 cm. It is wrapped with 500 turns of wire carrying a current of 2.0 A. The magnetic field at the center of the solenoid is:
9.9 x 10-8 T
1.3 x 10-3 T
4.2 x 10-2 T
16 T
20 T

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