Assuming that the radius of the circular path of the electron is 4.9cm when voltage is 100v and coil current is 1A and The Helmholtz coils have 130 turns and a radius of 15 cm. With N=130 and R=0.15 What is the magnetic field where the electrons are traveling that results from this 1 A current in the Helmholtz coils?  Hint: Evaluate the expression given for the field betwee two Helmholtz coils with the dimensions used in the experiment. Provide a numerical answer with no units, simply the field in "microtesla", that is in 10-6 T. For example, if you found 3.4 x 10-4 T, answer "340".

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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.