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i have just signed up to this site to find some assistance with the above topic.

i am building an electromagnetic propagator to study the effects of varying field strengths on the germination of seeds and the rooting of cuttings.

it has been many years since i last look into such a topic, and i need some help with my calculations.

would someone be kind enough to give me the formula for calculating the field strength produced by an electro magnet (this is my variable). i am only using the simplist of apparatus i.e. an iron core, insulated copper wire, a transformer (this experiment is for 12v only) and sodium lamps.

thanks in advance,

Ben