Two coplanar and concentric circular loops of wire carry currents of I1 = 6.90 A and I2 = 2.20 A in opposite directions as in the figure below. Let r1 = 12.0 cm and r2 = 8.50 cm. (Assume the positive direction along the axis perpendicular to the faces of the loops is out of the screen (towards you) and assume the positive vertical direction is toward the top of the screen.) (a)What is the magnitude of the net magnetic field (in µT) at the center of the two loops? µT (b)What is the direction of the net magnetic field at the center of the two loops? out of the screen, into the screen, toward the top of the screen, toward the bottom of the screen(c)Let r1 remain fixed at 12.0 cm and let r2 be a variable. Determine the value of r2 (in cm) such that the net field at the center of the loops is zero. cm

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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.