Question Part Points A simplified model of Earth\'s magnetic field has it origin

Question

Question Part Points A simplified model of Earth's magnetic field has it originating in a single current loop at the outer edge of the planet's liquid core (radius 2500 km). What current would give the 69 µTesla field measured at the north magnetic pole?
__________ A Question Part Points Question Part Points Question Part Points Question Part Points Question Part Points A simplified model of Earth's magnetic field has it originating in a single current loop at the outer edge of the planet's liquid core (radius 2500 km). What current would give the 69 µTesla field measured at the north magnetic pole?
__________ A A simplified model of Earth's magnetic field has it originating in a single current loop at the outer edge of the planet's liquid core (radius 2500 km). What current would give the 69 µTesla field measured at the north magnetic pole?
__________ A Question Part Points

Explanation / Answer

here,

radius , r = 2500 km

r = 2.5 * 10^6 m

let the current be I

magnetic feild , B = u0 * I /(2 *d)

69 * 10^-6 = 1.26 * 10^-6 * I /( 2 * 2.5 * 10^6)

solving for I

I = 2.4 * 10^8 A

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