A circular loop of wire has radius R = 0.0314m and carries a clockwise current of 8.00A. Whare are the magnitude and direction of the magnetic field of the coil at its center (point P in the sketch). I know the answer is 1.60 * 10^-4 T into page I don't understand how you know the answer is into page and not out of page.

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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.