# b&r_questions - Bar and Rail Example Problems(Answers...

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Bar and Rail Example Problems (Answers at the end) Question 1 The figure at right shows a wooden cylinder of mass M = 0.25 Kg, a radius R and a length l = 0.1m with a coil of N = 10 turns of wire wrapped around it longitudinally so that the plane of the coil is parallel to the inclined surface. The incline is tilted at an angle of θ , and a vertical filed of density B = 0.5T (perpendicular to the horizontal surface) exists everywhere. What is the least amount of current required to keep the cylinder from rolling down the incline? Assume the current, i is in the direction shown and verify whether it is positive or negative (i.e. reverse direction). Question 2 A long horizontal, rigidly supported wire carries a current of i a = 100A. Directly above and parallel to it is a fine rigid wire that has a mass, m = 7.5g/m carrying a current of 20A. How far above the bottom wire will the second wire "float" if it is to be suspended only by magnetic repulsion?

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b&r_questions - Bar and Rail Example Problems(Answers...

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