A long solenoid (1 500 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 mT
b. 55 mT
c. 48 mT
d. 68 mT
e. 2.0 mT
B
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