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Unformatted text preview: PHYS 153 Term 2, 2008-09 Homework 8A Mar. 16 - 20 Problem 1 The square loop shown in the figure below moves into a 0 . 80 T magnetic field at a constant speed of 10 m / s. The loop has a resistance of 0 . 10 , and it enters the field at t = 0 s. (a) Find the induced current in the loop as a function of time. Give your answer as a graph of I versus t from t = 0 s to t = 0 . 020 s. (b) What is the maximum current? What is the position of the loop when the current is maximum? Figure 1: fig. for Problem 1 Problem 2 A closed, square loop is formed with 40 cm of wire having R = 0 . 10 , as shown in the figure below. A 0 . 50 T magnetic field is perpendicular to the loop. At t = 0 s, each of the two diagonally opposite corners of the loop begins to move apart at 0 . 293 m / s relative to a fixed observer. (a) How long does it take the loop to collapse to a straight line? (b) Find an expression for the induced current I as a function of time while the loop is collapsing. Assume that the sides remain straight lines during the collapse.collapsing....
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