A student takes a strand of copper wire and forms it into a circular loop of circumference of 0.385 m. The student then places the loop in a uniform, constant magnetic field of magnitude 0.00313 T that is oriented perpendicular to the face of the loop. Pulling on the ends of the wire, they reduce the circumference of the loop to 0.127 m in a time interval of 0.612 s. Assuming that the loop remains circular as it shrinks, what is the magnitude of the average emf  induced around the loop during this time interval?

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Q: х х х XI X х х х х х х х х х

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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.