When you swipe a credit card, the machine sometimes failsto read the card. What can you do differently?(a) Swipe the card more slowly so that the reader has moretime to read the magnetic stripe.(b) Swipe the card more quickly so that the induced emf ishigher.(c) Swipe the card more quickly so that the induced currentsare reduced.(d) Swipe the card more slowly so that the magnetic fieldsdon’t change so fast.

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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.