A PMMC instrument has a coil area 12 mm X 10 mm. The flux density in the airgap is 1.5 m wb/m² and the spring control is 0.12 μ N-m / rad. i) Determine the number of turns required to produce an angular deflection of 90 degrees when a current of 5 mA is flowing through the coil. ii) Determine the current through the coil if turns are 100, Flux density is 1 wb/m and spring constant is 240 x 10 μ N-m.

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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.