At Geoncnetic the Earth's magnetic pole in the field northern hemisphere, the magnetic field has a strength of 0.6 G and points down toward the center of the Earth. You deduce that the Earth's magnetic field must be produced by a current loop deep inside the Earth! You guess that the radius of the loop is about 1300 km (the radius of the liquid metal layer known as the outer core). 

(a) How much current must it carry? 

(b) Does the current flow the same way as the Earth's rotation, or opposite? 

Gegmagnetic field upper Kubducting slab outer core plume head inner core plume tal slab remnant lower mande continent erogeny continent usasagas