A 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 near 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
C
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