What is the magnetic field a distance r from the center of a long wire that has radius a and carries a uniform current per unit area j in the positive z direction. What is the magnetic field, B→out(r→), outside the wire (i.e., when the distance r is greater than a). (Figure 1)   What is the magnetic field B→in(r→) inside the wire (i.e., when the distance r is less than a). (Figure 2)

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A: τ=IABB=τIA

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A: solution is given as

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A: solution as

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A: Option b is correct.

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A: The figure shows the coaxial cable with radius r from center and between 0.2 mm < r < 2 mm:

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.