A ring of mass m = 2 g rolls without slipping on a non-conducting horizontal surface with constant speed, which has a uniform distribution of charges. After connecting a uniform horizontal magnetic field B = 0.2 T perpendicular to the plane of the ring, the pressure force of the ring on the surface decreases by

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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.