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he accompanying figure shows a cross-section of a long, hollow, cylindrical conductor ofinner radiusr1= 3.0cmand outer radiusr2= 5.0cm. A 50-A current distributed uniformlyover the cross-section flows into the page. Calculate the magnetic field at

(a)r= 2.0cm

(b)r= 4.0cm

(c)r= 6.0cm

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