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# pq07ans - induced emf be when the coil leaves the magnetic...

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PHYS-1200 PHYSICS II FALL 2004 Post Quiz 7 Name____ ANSWERS _______________________ In the space provided, to the left of the question number, write the letter corresponding to the best answer to the question. _E _ 1. A magnet moves inside a coil. Consider the following factors: I. the strength of the magnet II. the number of turns in the coil III. the speed at which the magnet moves Which can affect the emf induced in the coil? A. I only B. II only C. III only D. I and II only E. I, II, III _B _ 2. A coil of wire goes from a region where there is no magnetic field into a region of high magnetic field, and then back out to a region where the magnetic field is zero. The orientation of the coil relative to the field does not change. As the coil enters the magnetic field, the induced emf is in the clockwise direction. In what direction will the
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Unformatted text preview: induced emf be when the coil leaves the magnetic field? A. Clockwise B. Counter-clockwise C. Need to know direction in which the coil is moving to answer D. Need to know the speed of the coil to answer E. No way to tell _B _ 3. A coil of wire having N turns, each of cross-sectional area A , is initially in a magnetic field of strength B , with the axis of the coil parallel to the magnetic field lines. The coil is then removed from the magnetic field and brought to a region where there is no magnetic field. What is the magnitude of ∫ E dt for this procedure, where E is the emf induced in the coil when it is removed from the field? A. dt d B Φ D. zero B. NBA E. It cannot be determined from the information given. C. 2 NBA...
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