I could really use some help on some questions! The problem is as follows: A thine wire of length L carries a current I and is positional on top of the x-axis( see picture attached for clarification). The left of the wire lies on the origin. a) What direction is the B-field at point P? b) Determine the magnitude of the B-field at point P. (answer must be written in terms of L, I and a) c) Check the answer from part A by taking the limit L--> ∞ and comparing it to the magnetic field of an infinite straight wire, B=µ0I/2πr. The picture of the wire is attached below for visual. I appreciate the help!

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Magnetic Field Of Coaxial Cable

The word coaxial means same axis. So for a long straight cable to be coaxial, it must have concentric cylindrical shaped conductor around it. Coaxial cable (popularly called ‘coax’) has various applications ranging from current conductors to radiofrequency signal transmitters. This cable has lower emission losses and provides protection from electromagnetic interference which allows signals with less power to transmit over longer distances.For example, currents produced in the pickup of a stereo turntable generally travel to the amplifier through a coaxial cable.The self-inductance of a coaxial cable is another important characteristic, because it influences the propagation of electrical signals in the cable.