Two long and parallel conductors carrying equal currents of I = 4.0A are placed at two opposite corners of a square. The direction of the magnetic field produced by each wire is shown as circles in the figure (upper left: counterclockwise; lower right: clockwise). (a) What is the direction of the current flowing in the upper left wire? (b) What is the direction of the current flowing in the lower right wire? (c) Calculate the magnitude of the net magnetic field at point P, located at the center of the square. Note: each side of the square has a length of 50cm. (d) What isthe direction of the net magnetic field at point P?

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Q: P d 12

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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.