A charge q is distributed uniformly around a thin ring of radius r.The ring is rotating about an axis through its center and perpendicular to its plane, at an angular speed v. (a) Show that the magnetic moment due to the rotating charge has magnitude m mw 1/2 qvr 2 . (b) What is the direction of this magnetic moment if the charge is positive?

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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.