Scientists have studied the aerodynamic forces generated by a flying insect by tethering it to the center of a taut, horizontal wire. As the insect “flies” in a wind tunnel, the insect exerts forces on the wire that a researcher can detect by measuring the wire’s deflection. To calibrate the wire, a known force must be applied to it. This is done by passing a current through the wire while it is positioned in a magnetic field that is perpendicular to the wire. The researcher requires the force on the wire to point upward with a magnitude of 4.2 x 10-4 N. The length of the wire that is in the field is 50 mm, and the wire carries a current of 30 mA from left to right. What direction and magnitude of magnetic field will provide the necessary force?

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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.