Serway_PSE_quick_ch31

# Serway_PSE_quick_ch3 - Physics for Scientists and Engineers 6e Chapter 31 Faradays Law A circular loop of wire is held in a uniform magnetic field

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Physics for Scientists and Engineers, 6e Chapter 31 – Faraday’s Law

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A circular loop of wire is held in a uniform magnetic field, with the plane of the loop perpendicular to the field lines. Which of the following will not cause a current to be induced in the loop? 1 2 3 4 25% 25% 25% 25% 1 2 3 4 5 1. crushing the loop 2. rotating the loop about an axis perpendicular to the field lines 3. keeping the orientation of the loop fixed and moving it along the field lines 4. pulling the loop out of the field
In all cases except this one, there is a change in the magnetic flux through the loop.

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The figure below shows a graphical representation of the field magnitude versus time for a magnetic field that passes through a fixed loop and is oriented perpendicular to the plane of the loop. The magnitude of the magnetic field at any time is uniform over the area of the loop. Rank the magnitudes of the emf generated in the loop at the five instants indicated, from largest to smallest. 1 2 3 4 5 20% 20% 20% 20% 20% 1 2 3 4 5 1. a, b, c, d 2. b, d, a, c 3. c, d, b, a 4. d, c, a, b 5. e, a, d, c
Specifically, c , d = e , b , a . The magnitude of the emf is proportional to the rate of change of the magnetic flux. For the situation described, the rate of change of magnetic flux is proportional to the rate of change of the magnetic field. This rate of change is the slope of the graph in Figure 31.4. The magnitude of the slope is largest at c . Points d and e are on a straight line, so the slope is the same at each point. Point d represents a point of relatively small slope, while a is at a point of zero slope because the curve is horizontal at that point.

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Suppose you would like to steal power for your home from the electric company by placing a loop of wire near a transmission cable, so as to induce an emf in the loop (an illegal procedure). You would have to 1 2 50% 50% 1 2 3 4 5 1. place your loop so that the transmission cable passes through your loop 2. simply place your loop near the transmission cable
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## This note was uploaded on 01/19/2010 for the course PHYS 200 taught by Professor Davies during the Spring '08 term at Roger Williams.

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Serway_PSE_quick_ch3 - Physics for Scientists and Engineers 6e Chapter 31 Faradays Law A circular loop of wire is held in a uniform magnetic field

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