Practice Exam 3_B

# Practice Exam 3_B - 1 The diagram shows three equally...

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1. The diagram shows three equally spaced wires that are perpendicular to the page. The currents are all equal, with #1 and #3 being out of the page and #2 being into the page. Rank the wires according to the magnitudes of the magnetic forces on them, from least to greatest . A) 3, 2, 1 B) 1, 2, 3 C) 2, 1 and 3 tie D) 2 and 3 tie, then 1 E) 1 and 3 tie, then 2 2. Two long straight wires enter a room through a window. One carries a current of 3.0 A into the room while the other carries a current of 5.0 A out. The magnitude of the path integral B dl G G v in T m around the outer edge of the window is: 3. In the lecture demonstration shown below we had two solenoids. The solenoid on the right, connected to the ammeter, G, can be fixed at different positions with respect to the solenoid on the left. Which of the following statements is/are correct? 1. There is a current in G just after S is opened or closed. 2. The magnitude of any current in G depends on the relative position of the solenoids 3. The direction of any current in G will always be the same 4. There is a steady deflection (current) in G as long as S is closed 5. The deflection of G can be increased by inserting an iron bar inside the left solenoid Version 1 Page 1

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