Recall that the gravitational force Fg between two masses m1 and m2 is given by the Universal Law of Gravitation: Fg= ?????/?2 where G = 6.67 x 10-11 Nm2/kg2 and r is the distance between the masses. (a) If the mass of the proton is 1.67 x 10-27 kg, calculate the ratio of the electric force to the gravitational force between the electron and the proton in the hydrogen atom. (answer: Fe/Fg = 2.26 x 1039) (b) Does it make sense to completely ignore the gravitational force that the proton exerts on the electron?

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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.