rev20sp09 - March 19, 2009 PHY 2054 Discussion Spring 09...

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March 19, 2009 PHY 2054 Discussion Spring ‘09 Conceptual Review: Chapter 21 A . Magnetic Flux 1. Write down the unit for magnetic flux using V. 2. A cube is in a uniform magnetic field. What is the total flux through the cube? 1. How do you actually use the minus sign in Faraday’s law? 2. The current in the long straight wire is increasing in the figure 1. What is the direction of the current induced in the loop? C. Motional Emf 1. A steal beam along east-west direction is falling toward Earth’s surface near the equator. Which end of the beam is positive? 2. An N -turn coil with length l and width w has resistance R . What is the magnetic force on the loop when it moves into a uniform magnetic field B ? 1. An AC generator with a cross sectional area of 1 m 2 rotates at a frequency of 50 Hz in a 1-T magnetic field perpendicular to the axis of rotation. Compare the maximum induced emf with the average induced emf as the angle between the normal and the field changes from 0 to π/2.
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rev20sp09 - March 19, 2009 PHY 2054 Discussion Spring 09...

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