A  copper wire hangs vertically from a tree limb down to the ground, 3.0 meters below. A child connects the ends of the wire to a power supply to send current downward through it. The Earth’s magnetic field at that location points North, but at a 22-degree angle below the horizontal. The magnitude of the Earth’s magnetic field is 1.50 X 10-4 Tesla. (a) Calculate the amount of  current needed so that the magnetic field applies a force to the wire of 0.050 Newtons. (b) What is the direction of the force? (up, down, east, west, north, south?

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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.