N A long current-carrying wire, oriented North-South, lies on a table (it is connected to batteries which are not shown). A compass lies on top of the wire, with the compass needle about 3 mm above the wire. With the current running, the compass deflects 12 degrees to the West. At this location, the horizontal component of the Earth's magnetic field is about 2e-5 tesla. Part 1 Your answer is incorrect. What is the magnitude of the magnetic field at location A, on the table top, a distance 2.7 cm to the East of the wire, due only to the current in the wire? B = i ! tesla