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qz5sol_8704sm10 - TA Tomoyuki Nakayama Friday July 2 2010...

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TA: Tomoyuki Nakayama Friday, July 2, 2010 PHY 2048: Physic 2, Discussion Section 8704 Quiz 5 (Homework Sets #8 & #9) Name: UFID: Formula sheets are not allowed. Calculators are allowed. Do not store equations in your calculator. You need to show all of your work for full credit. ________________________________________________________________________________ In the figure below right, a long straight wire carries a current i 1 = 80.0 A and a square loop carries current i 2 = 50.0 A. Take a = 5.00 cm and L = 20.0 cm. a) What are the magnitude and direction of the force exerted on the top edge of the loop? What are the magnitude and direction of the force exerted on the bottom edge? (To show the directions of the forces, draw arrows in the figure.) The strength of the magnetic field due to a long straight wire depends on the perpendicular distance r from the wire and it is given by B = μ 0 i/(2 π r). Therefore, the fields at the top and bottom edges are, respectively B T = μ 0 i 1 /(2 π a), B B = μ 0 i 1 /(2 π (a+L)) The right-hand rule tells you that the direction of the field below the straight wire is out of the paper. (Point your thumb in
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