A wire that has a cross sectional area of 2.0 x 10-6 m2 has a resistance of 1.4 x 10-1 ohm at 20° Celsius has a length of 5.0 meters. This Wire is made of?

I'm thinking it's 2 you are asked to explain the earth's magnetic field. which is the best reply? 1. the earth's magnetic south is similar to the north pole of a magnet. 2. the earth's core has a strong magnetic charge similar to the south pole of a magnet. 3. the earth's geomagnetic south is similar to the south pole of a magnet. 4. the earth's magnetic charge is not centered at either pole; it varies based on location.