Experiments have shown that thought processes in the mind can be affected if the parietal lobe is exposed to a magnetic field with strength of 1.0 T. Compute how much current must a long, straight wire carry if it is to produce a 1.0 T magnetic field at a distance of 0.40 meter? (For comparison, a typical lightning bolt carries a current of about 20,000 Amp, which would melt most wires.)
__________? A