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For problem 47, part b, calculate the magnetic field in microteslas if the radius of the wire is 6.1 mm (5 sig figs)

..47 ILW The current density in-
side a long, solid, cylindrical wire of radius a = 3.1 mm is in the di-
rection of the central axis, and its magnitude varies linearly with
radial distance r from the axis according to J = Jor/a, where Jo
=
PROBLEMS
861
S = R. The two coils carry equal currents i
=
12.2 mA in the same di-
rection. Find the magnitude of the net magnetic field at P, midway
between the coils.

QUESTION 4
For problem 29.47, part b, calculate the magnetic
field in microteslas if the radius of the wire is 6.1
mm. 5 sig. figs.

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