An infinitely long wire, located on the z-axis, carries a current I along the +z-direction and produces the magnetic field \(\bar{B}\) . The magnitude of the line integral \(∫ \overrightarrow{B}.\overrightarrow{dl}\) along a straight line from the point \( (−√3a, a, 0) \)to \((a, a, 0)\) is given by [\(\mu_0\) is the magnetic permeability of free space.]