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Unformatted text preview: hopkins (tlh982) – HW07 – criss – (4908) 1 This print-out should have 6 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. 001 10.0 points A long cylindrical shell has a uniform current density. The total current flowing through the shell is 8 mA. The permeability of free space is 1 . 25664 × 10- 6 T · m / A . 1 k m 7 cm 2 cm b The current is 8 mA . Find the magnitude of the magnetic field at a point r 1 = 4 . 5 cm from the cylindrical axis. Answer in units of nT. 002 10.0 points In 1962, measurements of the magnetic field of a large tornado were made at the Geophysical Observatory in Tulsa, Oklahoma. The permeability of free space is 1 . 25664 × 10- 6 T · m / A. If the tornado’s field were 2 . 15 × 10- 8 T pointing north when the tornado was 18 . 48 km east of the observatory, what cur- rent was carried up or down the funnel of the tornado? Model the vortex as a long straight wire carrying a current. Answer in units ofwire carrying a current....
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