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Rail Gun A rail gun uses electromagnetic forces to accelerate a projectile to very high velocities. The basic mechanism of acceleration is relatively simple and can be illustrated in the following example. A metal rod of mass 50.0 g and electrical resistance 0.100 Ω rests on parallel horizontal rails that have negligible electric resistance. The rails are a distance L = 10.0 cm apart. The rails are also connected to a voltage source providing a voltage of V = 5.00 V. The rod is placed in a vertical magnetic field. The rod begins to slide when the field reaches the value B = 4.90×10−2 T. Assume that the rod has a slightly flattened bottom so that it slides instead of rolling. Use 9.80 m/s2 for the magnitude of the acceleration due to gravity. Find μs, the coefficient of static friction between the rod and the rails? Current carrying conductor experiences a magnetic force in horizontal direction as B is in zdirection and current flow is in y-direction. Conductor slides when B becomes 4.9*10-2 T. This should be equal to frictional force. Hence, we should have s mg BIL s 5 V 0.1 L 4.9 102 0.1 R 0.5 . Ans. 50 mg 9.8 1000 B