A physics book has a mass of 2 kg. About how much does it weigh? (use g = 10 m/s^2) A. 2.0 N
B. 20 N
C. 12 N
D. 0.2 N

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.