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The figure shows a cross section across a long cylindrical conductor of radius a = 1.62...

The figure shows a cross section across a long cylindrical conductor of radius a = 1.62 cm carrying uniform current 75.3 A. What is the magnitude of the current's magnetic field at radial distance (a) 0, (b) 0.797 cm, (c) 1.62 cm (wire's surface), (d)2.09 cm?

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