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Unformatted text preview: terry (ect328) – oldhomework 23 – Turner – (59130) 1 This print-out should have 11 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. 001 10.0 points Given: A loop with current I produces a magnetic moment μ , as shown below. μ Consider the following four configurations of two loops each, A , B , C , and D . The placement and current directions of the loops are shown below. The loops are characterized by their magnetic moments μ . μ μ μ μ μ μ μ μ A B C D For configurations A and B , assume that the two current loops have the same axis and move freely along the axis. For configurations C and D , assume that the two current loops are on in same plane and move freely only in that plane. In which case(s) are the current loops at- tracted to one-another? 1. A , C correct 2. A 3. None of these. 4. A , D 5. B , D 6. B 7. D 8. B , C 9. C Explanation: If we consider the magnetic moments as a small magnets, then opposite poles will at- tract (N and S), and same poles will repel each other (N and N, S and S). In case of A and C, opposite poles are facing each other, so the system is stable. 002 10.0 points A small magnet of length 6 . 9 cm is placed at an angle of 60 ◦ to the direction of uniform magnetic field of magnitude 0 . 03 T. The observed torque has a magnitude of 0 . 04 N m. Find the magnetic moment of the magnet. Correct answer: 1 . 5396 A m 2 . Explanation: Let : θ = 60 ◦ , B = 0 . 03 T , and τ = 0 . 04 N m . The magnitude of the torque acting on the magnet is τ = μ B sin θ , μ = τ B sin θ = . 04 N m (0 . 03 T) sin 60 ◦ = 1 . 5396 A m 2 ....
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- Fall '09
- Magnetic Field, Terry, Magnetic moment