1. Calculate the theoretical value of e/m using the known values of the electric charge and electron mass.  2. A student performs this lab using a pair of coils with radius R = 10 cm and N = 98 windings. Using the equation in the theory, calculate the magnetic field at the center of both coils when the coil current is 4.3 A. 3. Using the same coil current as question 2, the student measures a beam radius of 7.5 mm when the accelerating voltage is 70 V. Using equation 5 in the theory (and your B-field from question 2) calculate the value of e/m. 4. Calculate the percent error between your result for question 3 and the theoretical value of e/m.

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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.