The solar corona is the Sun's hot (~1 MK) outer atmosphere. It's so hot that it's essentially fully ionized and is therefore an excellent electrical conductor. A cylindrical section of the corona has resistivity 1.62 x 10-8 Ω⋅m (slightly better than copper at room temperature) and carries a current of 644 kA along the long dimension of the cylindrical region. Given that the current density in the region is 1.08 mA/m2, find the diameter of the region, and find the electric field in the region.

The solar corona is the Sun's hot (~1 MK) outer atmosphere. It's so hot that it's essentially fully ionized and is therefore an excellent electrical conductor. A cylindrical section of the corona has resistivity 1.62 x 10-8 Ω⋅m (slightly better than copper at room temperature) and carries a current of 644 kA along the long dimension of the cylindrical region. Given that the current density in the region is 1.08 mA/m2, find the diameter of the region, and find the electric field in the region.

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