Two coplanar circular loops of wire carry currents of I1 = 4.0 A and I2 = 3.0 A in opposite directions as in the figure. When r = 3.0 cm, (c) what is the magnitude of the NET magnetic field at the center of the two loops? (d) Determine the value of r such that the net field at the center is zero.

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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.