Solenoid: An ideal solenoid is wound with 470 turns on a wooden form that is 4.0 cm in diameter and 50 cm long. The windings carry a current in the sense shown in the figure. The current produces a magnetic field of magnitude 4.1 mT, at the center of the solenoid. What is the current I in the solenoid windings? (?0 = 4? × 10-7 T ? m/A)
A. 3.5 A
B. 3.0 A
C. 2.6 A
D. 4.3 A
E. 3.9 A
Answer: A
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