Which of the following are true?   I. In a ferromagnet, permanent atomic magnetic moments tend to align parallel to each other even in weak or zero external field. II. When a paramagnet is placed in an external magnetic field, the atomic moments tend to line up with the field. III. If a diamagnet is placed in an external field, weak magnetic moment is induced in the same direction as the applied field. IV. In all forms of magnetism, magnetic moments are randomized by subjecting the material to higher temperature.     II, III and IV only     I and II only     I, II and III only     I, II and IV only

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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.