physics
posted by Anonymous .
The current density in a cylindrical conductor of radius R = 59.5 cm, varies as J(r) = J0r/R (in the region from zero to R), where J0 = 0.423 C/m2.
a) Find the magnitude of the magnetic field at r = 29.75 cm.
b) Find the magnitude of the magnetic field at r = 119 cm
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