Solenoid: How much current must pass through a 400-turn ideal solenoid that is 4.0 cm long to generate a 1.0-T magnetic field at the center? (?0 = 4? × 10-7 T ? m/A)
A. 0.013 A
B. 13 A
C. 22 A
D. 40 A
E. 80 A
Answer: E
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