We have presented the linear dc machine with an applied

Chapter 16, Problem P16.25

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We have presented the linear dc machine with an applied magnetic field, such as we might have in a dc motor. However, forces are exerted on the slider by the magnetic field produced by the currents in the rails. This is the principle of the electromagnetic rail gun for which you can find many references on the web including many practical construction tips. A version of such a rail gun is shown in Figure P16.25. a. When the switch closes, in which direction is force exerted on the projectile? Use physical principles discussed in this book to explain how you arrived at your answer. b. Suppose that the projectile mass is 3 g (which is about that of a penny). Assuming that all of the energy stored in the capacitor is transferred to kinetic energy in the slider, determine its final velocity. (Note:The highest velocity achievable by ordinary rifle bullets is about 1200 m/s.) c. List as many effects as you can that cause the velocity to be lower than the value calculated in part (b). 10 kV 1000 mF Projectile Rails + Figure P16.25

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