Question #343188

determine the Current in a long straight wire that would produce a magnetic field that produces a Magnetic Field four times that of Earth's Magnetic Field located at a distance 9.0 cm from the wire. (assuming that the Earth's Magnetic Field is equal to 5x10^(-5)T and \mu _(0)=4\pi x10^(-7)T. m/A).

Expert's answer

"I=\\frac{2\\pi r B}{\\mu_0}=\\frac{2\\pi * 0.09*4*5*10^{-5}}{4\\pi*10^{-7}}=90\\:\\rm A"

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