What is the length of the y-component of the vector plotted below?

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.

Give one example to show that when substances are mixed,it may result in a chemical or a physical change depending on the conditions.

The strong nuclear force acts over a small distance than the electrostatic force. true or false