You are helping to design a new device to measure the blood flow through arteries as a diagnostic device for heart surgery. The idea is to use microsurgery to attach small wires to opposite sides of an artery. The wires are brought outside of the body and attached to a voltmeter. Helmholtz coils outside the body are then used to create a uniform magnetic field at the artery that is perpendicular to the blood flow and to the direction between the wire attachment points. After the magnetic field is turned on, the ions in the blood come to equilibrium such that there is a constant electric field in the artery. You decide to calculate the smallest velocity of blood flow that this device can measure for an artery of diameter 3 mm in a magnetic field of 0.5 T if the voltmeter is accurate to 1 microvolt. [Hint: This is a Hall effect problem.]

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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.