P213FinalExam2006

# P213FinalExam2006 - Physics 213 Practice Final Fall 2007...

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Physics 213 Practice Final Fall 2007 page 2 of 13 1. True/False [10 points] Indicate T (True) or F (False) in the space at left for each of the following statements. ____ An appropriate unit for impedance is Ohm-second ( -s). ____ The magnetic forces between the adjacent coils of a solenoid act to decrease the solenoid length and increase its radius. ____ The integral of r B " d r A over a closed surface, in the case of a uniform magnetic field, is equal to the total surface area times the magnetic field magnitude. ____ A charged particle subject only to magnetic forces has constant kinetic energy. ____ To cause a time-varying magnetic flux through a circular loop confined to a region with a uniform magnetic field r B , you can move the loop in a direction perpendicular to r B . ____ A bar magnet dropped into the top of a vertical aluminum tube will be emerge from the tube’s bottom more slowly than a non-magnetic bar dropped through the tube. ____ The asymptotic current in an R-L circuit powered by an ideal battery with emf E depends on the values of all of R, L and E . ____ The ratio of units [E]/[B] is “meters / second” in the MKS system. ____ In an AC circuit, a capacitor is effectively "invisible" at very high frequency, i.e. virtually indistinguishable from an ideal conductor. ____ The peak power in an AC circuit is given by the average power multiplied by 2 .
Physics 213 Practice Final Fall 2007 page 3 of 13 2. [3 points] A conductor has electrons as the charge carrier of electric current. You place the conductor in a region containing a uniform magnetic field in the positive z direction ( r B = B ˆ k , out of page). If you run an electric current in the positive x direction ( r J = J ˆ i ) through your conductor, then a Hall effect voltage difference would result from an electric field in what direction? 1. +x direction

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P213FinalExam2006 - Physics 213 Practice Final Fall 2007...

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