When the valve between the 2.00-L bulb, in which the gas pressure is 2.50 atm, and the 3.00-L bulb, in which the gas pressure is 1.50 atm, is opened, what will be the final pressure in the two bulbs? Assume the temperature remains 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.