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The rod is placed in a vertical magnetic field. The rod begins to slide when the field reaches the value B = 0.116 T. Assume that the rod has a slightly flattened bottom so that it slides instead of rolling. Use 9.80 m/s for the magnitude of the acceleration due to gravity. Find is, the coefficient of static friction between the rod and the rails.Use g for the magnitude of the acceleration due to gravity.Part A Find μs, the coefficient of static friction between the rod and the rails.Express the coefficient of static friction in terms of variables given in the introduction.μs =So, the coefficient of static friction is equal to the tangent of the angle at which the objects slide. A similar method can be used to measure μk. To do that you give the top object a push as you increase the angle. When the top object keeps sliding with constant velocity, the tangent of that angle is equal to μk.friction between the rod and the rails, and (b) if the coefficient of friction is μ k (c) In which direction does the rod move, east or west, if the current through it heads north?Chapter 28: Sources of Magnetism 2. (I) If an electric wire is allowed to produce a magnetic field no larger than that of the Earth (0.5×10-4 T) at a distance of 15 cm from the wire, what is the maximum current theThe uniform rod has a mass m = 15 kg, and length L = 0.5m. It is supported by the smooth (assume frictionless) ring at B. If, at the 30° angle shown, the rod is on the verge of slipping, determine the coefficient of static friction µ s between the rod and the floor at point A. N B N A f A mg ENGR 2311: STATICS!FALL 2015 EXAM 04!PAGE 2

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8-3 A 1.0 kg copper rod rests on two horizontal rails 1.0 m apart and carries a current of 50 A from one rail to the other. The coefficient of static friction between rod and rails is 0.60. What are the (a) magnitude and (b) angle (relative to the vertical) of the smallest magnetic field that puts the rod on the verge of sliding?The rod is placed in a vertical magnetic field. The rod begins to slide when the field reaches the value B = 0.168 . Assume that the rod has a slightly flattened bottom so that it slides instead of rolling. Use 9.80 m/s for the magnitude of the acceleration due to gravity. Find the coefficient of static friction between the rod and the rails?!this is a video describing the calculation of the coefficient of static friction. this is a video describing the calculation of the coefficient of static friction.A 0.92 kg copper rod rests on two horizontal rails 0.62 m apart and carries a current of 60 A from one rail to the other. The coefficient of static friction between rod and rails is 0.52. What is...

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A copper rod of mass 0.6 kg rests on two rails 1.3 m apart and carries a current of 31 A from one rail to the other. The coefficient of static friction is 0.3. What is the magnitude of the least magnetic field that would cause the bar to slide?1. FRICTION vs. THE LORENTZ FORCE: A 2.0-kg copper rod rests on two horizontal rails 2.0 m apart and carries a current of 100 A from one rail to the other. The coefficient of static friction between the rod and the rails is .What is the smallest magnetic field (not necessarily vertical) that would cause the bar to slide?A 0.200 kg metal rod carrying a current of 10.0 A glides on two horizontal rails 0.500 m apart. What vertical? magnetic field is required to keep the rod moving at a constant speed if the coefficient of kinetic friction between the rod and rails is 0.100?The coefficient of static friction between A and the ramp is 0.30. Which of the following is correct? a. Two blocks are in equilibrium b. A is moving upwards c. A is moving downwards Ans: a 8. What is the tension in the cable? Ans: 200 N 9. If the cable is now cut, check all that apply. a. A would side downwards b. A would not slideFind μsμsmu_s, the coefficient of static friction between the rod and the rails. Express the coefficient of static friction in terms of variables given in the introduction.

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