Solenoid: An ideal solenoid with 400 turns has a radius of 0.040 m and is 40 cm long. If this solenoid carries a current of 12 A, what is the magnitude of the magnetic field at the center of the solenoid? (?0 = 4? × 10-7 T ? m/A)
A. 16 mT
B. 4.9 mT
C. 15 mT
D. 6.0 mT
E. 9.0 mT
Answer: C
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