A high-voltage power line 20 m above the ground carries a current of 2 000 A. What is the magnetic field due to the current directly underneath the power line?
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Magnetic field B= mu nought I/(2pi r) in SI units. Mu nought = magnetic permeability of space = 4 pi x 10^-7, I = 2000 amps, r = 20 metres so B = 4 x pi x 10^-7 x 2000 / (2 pi x 20)=2 x 10^-7 /20 = 2.0 x 10^-5 teslas. So your answer is 20 microteslas
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