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# pe19f08 - Last updated PHY 2054 Discussion Fall 08 Practice...

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Last updated: October 15, 2008 PHY 2054 Discussion – Fall ‘08 Practice Exam Problems (Chapter 19) 1. Electrical charges and magnetic poles have many similarities, but one difference is: (Magnetic Poles) a. opposite magnetic poles repel. b. one magnetic pole cannot create magnetic poles in other materials. c. a magnetic pole cannot be isolated. d. magnetic poles do not produce magnetic fields. 2. The dip angle is: (Earth’s magnetic Field) a. another term for magnetic declination. b. a measure of the tendency for a compass to point south. c. close to or at zero near the equator. d. close to or at zero just north of Hudson Bay 3. An electron moves through a region of crossed electric and magnetic fields. The electric field E = 2 000 V/m and is directed straight down. The magnetic field B = 0.80 T and is directed to the left. For what velocity v of the electron into the paper will the electric force exactly cancel the magnetic force? (Magnetic Force) a. 2 500 m/s b. 4 000 m/s c. 8 000 m/s d. 8 000 m/s E B 4. If a proton is released at the equator and falls toward the Earth under the influence of gravity, the magnetic force on the proton will be toward the: (Right-Hand Rule) a. north b. south c. east d. west

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