Vector A S is 2.80 cm long and is 60.0° above the x-axis in the first quadrant. Vector B S is 1.90 cm long and is 60.0° below the x-axis in the fourth quadrant (Fig. E1.35). Use components to find the magnitude and direction of (a) A S + B S ; (b) A S − B S ; (c) B S − A S . In each case, sketch the vector addition or subtraction and show that your numerical answers are in qualitative agreement with your sketch

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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.