Calculate the magnetic field
A hollow cylindrical conductor has an inner radius a = 1.4 cm and an outer radius b = 4.7 cm. The total current through the cylinder is 90 A. Using Ampere's Law, calculate the magnetic field at
(a) r = 0.6 cm T
(b) r = 1.5 cm T
(c) r = 8.1 cm T
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