A long solenoid (n = 1200 turns/m, radius = 2.0 cm) has a current of a 0.30 A in its winding. A long wire carrying a current of 20 A is parallel to and 1.0 cm from the axis of the solenoid. What is the magnitude of the resulting magnetic field at a point on the axis of the solenoid?
◦ 0.60 mT
◦ 0.85 mT
◦ 52 μT
◦ 0.40 mT
◦ 0.75 mT