A circular current loop (with only one turn) has a radius of 4.82 cm and a current of 0.416 A runs through it. It is placed in a region with a uniform magnetic field of 944 mT. If it is oriented such that its dipole moment is antiparallel to the external magnetic field, the magnetic potential energy for the loop is most nearly  (A) -28 700 µJ. (B) -2870 µJ. (C) -2030 µJ. (D) 28 700 µJ. (E) 2870 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.