# barcode reader code in c# net The phenomenon we have just described is sometimes referred to as the Bli law in Software Creating QR in Software The phenomenon we have just described is sometimes referred to as the Bli law

The phenomenon we have just described is sometimes referred to as the Bli law
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The other mode of operation of a moving-coil transducer occurs when an external force causes the coil (ie, the moving bar, in Figure 1647) to be displaced This external force is converted to an emf across the coil, as will be explained in the following paragraphs Since positive and negative charges are forced in opposite directions in the transducer of Figure 1647, a potential difference will appear across the conducting bar; this potential difference is the electromotive force, or emf The emf must be equal to the force exerted by the magnetic eld In short, the electric force per unit charge (or electric eld ) e/ l must equal the magnetic force per unit charge f/q = Bu Thus, the relationship e = Blu (1658)
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which holds whenever B, l, and u are mutually perpendicular, as in Figure 1649 If equation 1658 is analyzed in greater depth, it can be seen that the product lu (length times velocity) is the area crossed per unit time by the conductor If one visualizes the conductor as cutting the ux lines into the base in Figure 1648, it can be concluded that the electromotive force is equal to the rate at which the conductor cuts the magnetic lines of ux It will be useful for you to carefully absorb this notion of conductors cutting lines of ux, since this will greatly simplify understanding the material in this section and in the next chapter In general, B, l, and u are not necessarily perpendicular In this case one needs to consider the angles formed by the magnetic eld with the normal to the plane containing l and u, and the angle between l and u The former is the angle of Figure 1649, the latter the angle in the same gure It should be apparent that the optimum values of and are 0 and 90 , respectively Thus, most practical
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Principles of Electromechanics
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devices are constructed with these values of and Unless otherwise noted, it will be tacitly assumed that this is the case The Bli law just illustrated explains how a moving conductor in a magnetic eld can generate an electromotive force To summarize the electromechanical energy conversion that takes place in the simple device of Figure 1647, we must note now that the presence of a current in the loop formed by the conductor and the rail requires that the conductor move to the right at a velocity u (Blu law), thus cutting the lines of ux and generating the emf that gives rise to the current i On the other hand, the same current causes a force f to be exerted on the conductor (Bli law) in the direction opposite to the movement of the conductor Thus, it is necessary that an externally applied force fext exist to cause the conductor to move to the right with a velocity u The external force must overcome the force f This is the basis of electromechanical energy conversion An additional observation we must make at this point is that the current i owing around a closed loop generates a magnetic eld, as explained in Section 161 Since this additional eld is generated by a one-turn coil in our illustration, it is reasonable to assume that it is negligible with respect to the eld already present (perhaps established by a permanent magnet) Finally, we must consider that this coil links a certain amount of ux, which changes as the conductor moves from left to right The area crossed by the moving conductor in time dt is dA = lu dt (1659)
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so that if the ux density, B, is uniform, the rate of change of the ux linked by the one-turn coil is dA d =B = Blu dt dt (1660)
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