Hi, I'm doin an investigation in physics - magnetism, to be specific - and basically I'm takin 1 or 2 bar magnets, and a hall probe, and placing the magnets at different distances from the probe, and different angles to see the variation in magnetic field strength. However, I need to extend it a lot more than this, and I'm not really sure how. I should do more research but I haven't had much time. I was wonderin if anyone could gimme some pointers on what I could do next, or gimme a site with some information on this topic. Thanks a lot.