Ampère’s Law The French physicist André-Marie Ampère (1775–1836) discovered that an electrical current I in a wire produces a magnetic field B. A special case of Ampère’s Law relates the current to the magnetic field through the equation ∮C B ⋅ dr = μI, where C is any closed curve through which the wire passes and μ is a physical constant. Assume the current I isgiven in terms of the current density J as I = ∫∫S J ⋅ n dS, where Sis an oriented surface with C as a boundary. Use Stokes’ Theoremto show that an equivalent form of Ampère’s Law is ∇ x B = μJ.

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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.