A small compass is held horizontally, the center of its needleadistance of 0.270 m directly north ofa long wire that isperpendicular to the earth's surface. Whenthere is no current inthe wire, the compass needle points duenorth, which is thedirection of the horizontal component of theearth's magnetic fieldat that location. This component is parallelto the earth's surface.When the current in the wire is26.3 A, the needle points 22.9° eastof north.
(a) Does the current in the wire flow towardoraway from the earth's surface?
1
toward the Earth's surfaceaway from theEarth'ssurface
(b) What is the magnitude of the horizontal component of theearth'smagnetic field at the location of the compass? 2 T
