Two concentric solenoids carry currents in opposite directions. The inner solenoid has 50 turns per centimetre, the outer solenoid 20 turns per centimetre. The inner coil carries a current of 0.80-A. (a) Calculate the current needed in the outer coil so that its field cancels the field produced by the inner coil. (b) How large a field is produced by the inner coil?

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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.