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A rod with a radius $R=1\mathrm{.}82mm$ is carrying a uniform current of $13\mathrm{.}0$ A $.$ Determine the magnetic field at the following distances from the center of the rod.

$($a$)r_a=\frac{R}{2}$

T

$($b$)r_b=3\frac{R}{2}$

T