Some animals are capable of detecting magnetic fields and use this sense to help them navigate. Suppose a high-voltage direct-current power line carries a current of 4.90 kA. How far from the wire would a homing pigeon have to be so the field due to the wire has magnitude 50.0 μT, which is comparable to Earth’s magnetic field at the surface?

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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.