The tube is equivalent to a straight conductor. The magnetic field around a conductor is given by Amperes law.

Amperes law:

$\overline{)\begin{array}{rcl}\mathbf{\oint}\mathbf{B}\mathbf{\xb7}\mathbf{d}\mathbf{L}& {\mathbf{=}}& {\mathbf{\mu}}_{\mathbf{0}}{\mathbf{i}}_{\mathbf{encl}}\\ {\mathbf{B}}& {\mathbf{=}}& \frac{{\mathbf{\mu}}_{\mathbf{0}}\mathbf{i}}{\mathbf{2}\mathbf{\pi}\mathbf{r}}\end{array}}$

What is the direction of the magnetic field inside the tube?

a. clockwise

b. counterclockwise

c. radially inward to the center

d. radially outward from the center

e. the magnetic field is zero

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