Which of the following are true about the magnetic force on a charge q with velocity v under the influence of an external magnetic field B? I. The magnetic force is perpendicular to v. II. The magnetic force is perpendicular to B. III. If the velocity of the charge is parallel with the external field, the magnetic force is zero. I V. If the charge is negative, the direction of the magnetic force will be based on the right-hand rule but rotated by 180o. a. I, II and IV only b. All four statements c. I and II only I d. II and III only

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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.