μοI/2πr is the expression for magnetic field due to an infinite current carrying wire. Which of the following is implied by this?

At every point on a circle of radius r, the field is same. The direction of field at any point on the circle of radius r is radial to it. Both 1 and 2 None of the above

At every point on a circle of radius r, the field is same.

The direction of field at any point on the circle of radius r is tangential to it.