A student set up an experiment to determine the magnetic field strength of a magnet as shown in the diagram. The student makes the reading on the balance as zero and places the magnet on the balance. The balance reads 132 g . He switches on the current from a supply and notices that the reading on the balance increases to 162 g while the current shown by the ammeter is 27 mA.    Find the magnetic field strength in tesla of the magnet if the length of the wire inside the field is 12 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.