An electromagnetic launcher, or rail gun, consists of two parallel conducting ra
ID: 1754752 • Letter: A
Question
An electromagnetic launcher, or rail gun, consists of two parallel conducting rails across which is laid a conducting bar, which serves as a projectile. To launch this projectile, the rails arc immersed in a magnetic field, and a current is sent through the rails and the bar (see Fig. 30. 31}. The magnetic force on the current in the bar then accelerates the bar (in actual rail guns of this kind, the magnetic field is itself produced by the current in the rails; but let us ignore this complication). Suppose that the magnetic field has a strength of 0. 20 T and the bar has a length of 0. 10 m and a mass of 0. 20 kg. Ignore friction. What current must you send through the bar to give it an acceleration of 1. 0 X 105 m/s2?Explanation / Answer
Given that the length of the rod is L = 0.10 m mass of rod is m = 0.20 kg accelaration is a = 1.0*105 m/s2 magnetude of magnetic field is B = 0.20 T ------------------------------------------------------------------------------------ The force on the conductor is F = IL*B =ILBsin F= ILBsin900 ma= ILB I= ma / LB =------- A magnetude of magnetic field is B = 0.20 T ------------------------------------------------------------------------------------ The force on the conductor is F = IL*B =ILBsin F= ILBsin900 ma= ILB I= ma / LB =------- ARelated Questions
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