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Unformatted text preview: rosen (arr956) – Homework 08 – Chiu – (58295) 1 This print-out should have 15 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. 001 10.0 points A 3 m long wire weighing 0 . 087 N / m is sus- pended directly above an infinitely straight wire. The top wire carries a current of 14 A and the bottom wire carries a current of 93 A . The permeablity of free space is 1 . 25664 × 10- 6 N / A 2 . Find the distance of separation between the wires so that the top wire will be held in place by magnetic repulsion. Answer in units of mm. 002 10.0 points A rectangular loop with dimensions (hori- zontal = 0 . 4 m) × (vertical= 0 . 92 m), is sus- pended by a string, and the lower horizontal section of the loop is immersed in a magnetic field. If a current of 5 . 1 A is maintained in the loop, what is the magnitude of the magnetic field required to produce a tension of 0 . 054 N in the supporting string? Assume: Gravita- tional force is negligible. Answer in units of T. 003 (part 1 of 2) 10.0 points Consider a current in the long, straight wire which lies in the plane of the rectangular loop, that also carries a current, as shown. 16 cm 6 . 5 cm 72cm ← 5 . 2A 12A → x y Find the magnitude of the net force exerted on the loop by the magnetic field created by the long wire. Answer in units of N. 004 (part 2 of 2) 10.0 points What is the direction of the net force? 1. only a torque, no net force 2. left 3. up 4. right 5. in 6. down 7. no net torque and no net force 8. out 005 (part 1 of 2) 10.0 points A cyclotron designed to accelerate protons of mass 1 . 673 × 10- 27 kg to an energy of 3 . 3 MeV has a diameter of 4 . 5 m....
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This note was uploaded on 11/28/2010 for the course PHY 56705 taught by Professor Turner during the Spring '10 term at University of Texas at Austin.
- Spring '10