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Hi can someone give me a clear explanation of how a current carrying conductor produces a magnetic field? I tried some sites but the closest I got to an understandable definition was yahoo! answers...

The problem I have is that I need to be able to change magnet strength in a really short period of time because I am testing 50g and then the 100g, 150g, 200g and 250g. And the magnet strength has to increase each time which means I will have to change the core 4 times... Your suggestion on...

We have to design a electromagnet in which settings can be changed to pick up an increasing amount of weight i.e. it can pick up 50 grams but not 100 grams, and then 100g but not 150g. We cannot change the voltage, the current, the resistance or the number of coils. The only variable left I can...