how to find part c?

D7.7. A solid conductor of circular cross section is made of a homogeneous
nonmagnetic material. If the radius a = 1 mm, the conductor axis lies on the
z axis, and the total current in the az direction is 20 A, find: (a) Hφ at ρ = 0.5mm;
(b) Bφ at ρ = 0.8 mm; (c) the total magnetic flux per unit length inside the
conductor; (d) the total flux forρ

Question

how to find part c?

D7.7. A solid conductor of circular cross section is made of a homogeneous
nonmagnetic material. If the radius a = 1 mm, the conductor axis lies on the
z axis, and the total current in the az direction is 20 A, find: (a) Hφ at ρ = 0.5mm;
(b) Bφ at ρ = 0.8 mm; (c) the total magnetic flux per unit length inside the
conductor; (d) the total flux forρ < 0.5 mm; (e) the total magnetic flux outside
the conductor.
Ans. 1592 A/m; 3.2 mT; 2 μWb/m; 0.5μWb;∞