Suppose we have a small circular coil of wire that has 400 turns of wire wound in the form of a loop 4 centimeters in diameter. When this coil is connected to a battery, the magnetic field it creates deflects a compass needle that is 20 centimeters away along the coil's axis by an angle of 35 degrees from north, as shown in the drawing. (The coil's plane is vertical, perpendicular to the plane of the drawing.) Assume that the horizontal part of the earth's magnetic field at our location has a magnitude of |Bearth| = 25 microtesla. What current flows in the coil? (Hint: the distant field of a loop is like that of a dipole.)

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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.