A 0.50-m long solenoid consists of 1000 turns of copper wire wound with a 4.0-cm radius. When the current in the solenoid is 18 A, the magnetic field at a point 1.0 cm from the central axis of the solenoid is
A. 0.090 mT.
B. 0.36 mT.
C. 23 mT.
D. 36 mT.
E. 45 mT.
Answer: E
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