Which of the following is true regarding the magnetic field magnitude at the center of a semi-circular current-carrying wire?  The magnetic field is not affected by any of the factors mentioned in the other choices. If the current in the wire is doubled, the magnetic field will also be doubled. If the radius of the circle is doubled, the magnetic field will also be doubled. If the arc is reduced to a quarter of a circle, the magnetic field will be doubled.

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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.