Consider a 2-coil (active) detector with an alternating current that creates a changing magnetic field in an exciter coil for a metal detector. Which of the following of Maxwell's equations would best describe the detection of the lost coin under the sand at the beach from the detection coil? a. $E OA . = 9 b. $B JA = 0 ▪ -OB c. $E.al=- at d. §B • Əl = µ₁(I + €0) at Simplify the above equation, if necessary/possible

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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.