Experiments have shown that thought processes in the brain canbe affected if the

Question

Experiments have shown that thought processes in the brain canbe affected if the parietal lobe is exposed to a magnetic fieldwith a strength of 1.0 T. How much current must a long, straightwire carry if it is to produce a 1.0 T magnetic field at a distanceof 0.40 m? (For comparison, a typicallightning bolt carries a current of about 20,000 A, which wouldmelt most wires.)

__________? A
Experiments have shown that thought processes in the brain canbe affected if the parietal lobe is exposed to a magnetic fieldwith a strength of 1.0 T. How much current must a long, straightwire carry if it is to produce a 1.0 T magnetic field at a distanceof 0.40 m? (For comparison, a typicallightning bolt carries a current of about 20,000 A, which wouldmelt most wires.)

__________? A

Explanation / Answer

magnetic field , B = ( 0 / 2 ) ( i / r)                           1 = 2 X 10 -7 * i / 0.4        current, i = 0.4 / (2 X 10 -7 ) = 0.2 X 10 7                                                       =20 X 10 5 A                                                       =20 X 10 5 A

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