Consider a Long, Straight, Thin Wire Carrying a Steady Current $\oint \vec { B } \cdot d \vec { s }$

Multiple Choice

Consider a long, straight, thin wire carrying a steady current. The value of $\oint \vec { B } \cdot d \vec { s }$ computed around a circle at some radius (orthogonal from the wire) is

A) larger as the radius is increased.
B) smaller as the radius is increased.
C) constant (not a function of the radius) .
D) none of the above.