This preview has intentionally blurred sections. Sign up to view the full version.
View Full Document
Unformatted text preview: Kapoor (mk9499) – homework23 – Turner – (60230) 1 This printout should have 11 questions. Multiplechoice 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 oneanother? 1. A 2. B 3. A , D 4. B , D 5. B , C 6. D 7. A , C correct 8. None of these. 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 7 . 1 cm is placed at an angle of 50 ◦ to the direction of uniform magnetic field of magnitude 0 . 04 T. The observed torque has a magnitude of 0 . 1 N m. Find the magnetic moment of the magnet. Correct answer: 3 . 26352 A m 2 . Explanation: Let : θ = 50 ◦ , B = 0 . 04 T , and τ = 0 . 1 N m . The magnitude of the torque acting on the magnet is τ = μ B sin θ , μ = τ B sin θ = . 1 N m (0 . 04 T) sin 50 ◦ = 3 . 26352 A m 2 ....
View
Full
Document
This note was uploaded on 06/28/2009 for the course PHY 303L taught by Professor Turner during the Fall '08 term at University of Texas.
 Fall '08
 Turner
 Physics, Current, Work

Click to edit the document details