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Answers to Quick Quizzes 925 Describe the path of the particle under this condition, and Answers to Quick Quizzes charge is proportional to the charge’s velocity relative to 29.2 (b). The maximum value of sin ! occurs for ! " 90°. account for the negative charge on the electron. 29.4 (a), (b) " (c), (d). The magnitude of the force depends on the value of sin !. The maximum force occurs when zero force when the wire is parallel (d). Choices (b) and 29.5 (c). Use the right-hand rule to determine the direction of the magnetic field. 29.6 (c), (b), (a). Because all loops enclose the same area and carry the same current, the magnitude of " is the B and the torque is zero. For (b), the torque is intermediate between zero and the maximum 29.7 (a) " (b) " (c). Because the magnetic field is uniform, there is zero net force on all three loops. 29.8 (b). The magnetic force on the particle increases in pro- portion to v, but the centripetal acceleration increases 29.9 (a). The magnetic force on the particle increases in pro- portion to B. The result is a smaller radius, as we can see 29.10 Speed: (a) " (b) " (c). m/q ratio, from greatest to least: (c), (b), (a). The velocity selector ensures that all three h + v B Figure P29.72 |