An electric current I = 0.35 A is flowing in an infinitely long wire. Part (a)  Write an equation for the magnetic field vector B generated by the current an an arbitrary point in terms of I, the length element dl, and the vector for the distance R from dl to the point.   Part (b)  If the distance from point A to the wire is a as in the figure, write an equation for the magnitude of the magnetic field |B| generated by the current at A in terms of I and a.  Part (c)  If a = 0.065 m, calculate the numerical value of B in tesla.

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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.