29.23     A circular loop of wire with radius r = 0.0250 m and resistance R = 0.390 Ohms is in a region of spatially uniform magnetic field, as shown in Fig. E29.23.  The magnetic field is directed into the plane of the figure.  At t = 0, B = 0.  The magnetic field then begins increasing, with B(t) = (0.380 T/s3)t3.  What is the current in the loop (magnitude and direction) at the instant when B = 1.33 T?

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Q: magnitude of the magnetic field

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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.