A long straight conductor has a constant current flowing to the right. A wire rectangle is situated above the wire, and also has a constant current flowing through it (as shown in the figure). Which of the following statements is true? A) The net magnetic force on the wire rectangle is zero, and the net torque on it is zero. B) The net magnetic force on the wire rectangle is zero, but there is a net torque on it. C) The net magnetic force on the wire rectangle is upward, and there is also a net torque on the it. D) The net magnetic force on the wire rectangle is downward, and the net torque on it is zero. E) The net magnetic force on the wire rectangle is downward, and there is also a net torque on the it.

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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.