The magnetic field at r < a:
B = μ0(πr2J)/(2πr) = (μ0rJ)/2
An electric current is flowing through a long cylindrical conductor with radius a = 0.15 m. The current density J= 5.5 A/m2 uniform in the cylinder. In this problem, we consider an imaginary cylinder with radius r around the axis AB
(a) Express B in terms of J and r.
(b) For r = 0.5a, calculate the numerical value of B in Tesla
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