A long solenoid (1500 turns/m) carries a current of 20 mA and has an inside diameter of 4.0 cm. A long wire carries a current of 2.0 A along the axis of the solenoid. What is the magnitude of the magnetic field at a point that is inside the solenoid and 1.0 cm from the wire?
A. 78 ?T
B. 55 ?T
C. 48 ?T
D. 68 ?T
E. 2.0 ?T
Answer: B
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