In 1962, measurements of the magnetic field of a large tornadowere made at the G

Question

In 1962, measurements of the magnetic field of a large tornadowere made at the Geophysical Observatory in Tulsa, Oklahoma. If themagnitude of the tornado's field was B = 14.50 nT pointing north when the tornado was9.90 km east of the observatory, whatcurrent was carried up or down the funnel of the tornado? Model thevortex as a long, straight wire carrying a current.
1 A (conventional current) flowing 2---Direction---downup the tornado. up or down In 1962, measurements of the magnetic field of a large tornadowere made at the Geophysical Observatory in Tulsa, Oklahoma. If themagnitude of the tornado's field was B = 14.50 nT pointing north when the tornado was9.90 km east of the observatory, whatcurrent was carried up or down the funnel of the tornado? Model thevortex as a long, straight wire carrying a current.
1 A (conventional current) flowing 2---Direction---downup the tornado. up or down

Explanation / Answer

Magnetic field at a distance r from the long straightwire is B = i / 2 r from this current i = B ( 2 r ) / where B = magnetic filed = 14.5 * 10 ^ -9 T            r = distance = 9.9 * 10 ^ 3 m           = permeability of free space = 4 * 10 ^ -7 H / m substitue values you get   i = 717.75 A

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