Wo carbon atoms are joined by a spring-like carbon-carbon bond. the potential energy stored in the bond has the value you calculated in part a if the bond is stretched 0.050 nm. what is the bond's spring constant?

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.