Final answer:
Young domestic chickens have the ability to orient themselves in the Earth's magnetic field. Researchers used two coils in an experiment to adjust the magnetic field in the chicks' pen and observed the orientations of small compass needles to map out magnetic field lines.
Step-by-step explanation:
Young domestic chickens have the ability to orient themselves in the earth's magnetic field. In the experiment described, researchers used two coils to adjust the magnetic field in the chicks' pen. One coil was parallel to the ground and pointed to the north, while the other coil was oriented vertically. The Earth's magnetic field was measured to have a magnitude of 5.6×10-5T, tilted up from the horizontal by 61 degrees.
The magnetic field lines can be observed experimentally using small compass needles, which align themselves with the magnetic field at each location. By mapping out the orientations of the compass needles, researchers can precisely determine the magnetic field lines created by the coils.