A wire of length L = 0.25 m and mass m = 0.085 kg carries a current of I = 0.55 A. The wire is floating at rest in a magnetic field as shown in the figure. Part (a)  What are the forces acting on the wire, and which directions do they go?  Gravity, downward. Magnetic force, upward. Magnetic force, downward. Gravity, downward. Gravity, upward. Magnetic force, downward. Magnetic force, upward. Gravity, upward. Part (b)  Express the magnitude of the magnetic force in terms of the current I, length L and the magnetic field B.  Part (c)  Given the fact that the wire is floating at rest, derive an expression for B.   Part (d)  Calculate the numerical value of B in tesla.

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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.