2003 Exam 2 extra problems

2003 Exam 2 extra problems - 13(5 points You are to wrap a...

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13. (5 points) You are to wrap a fixed length of wire into a circular coil with one or more turns and connect the two ends of the wire to a battery to cause a current to flow. How many turns should you put into the wire to cause the coil to experience the largest possible torque in a uniform magnetic field? a) 1 b) 10 c) As many as possible d) The number of turns does not matter 14. (5 points) A particle with positive charge q , mass m , and initial speed v o moves in a circular orbit of radius r in a uniform magnetic field of magnitude B . After completing one orbit, how much work has been done on the particle by the field? a) 2 π rqv o B b) mv o 2 /2 c) qv o 2 B d) 0 16. (5 points) An oil level sensor can be constructed by connecting a battery and a current meter to a parallel plate capacitor with its plates oriented vertically, as shown in the figure. (The current meter is omitted for clarity.) When oil (a dielectric with constant κ ~ 4) rises between the plates of the capacitor, current flows and the
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2003 Exam 2 extra problems - 13(5 points You are to wrap a...

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