Quiz07_solutions

# Quiz07_solutions - Physics 222 Name Section Quiz 7A Fall...

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Physics 222 Fall 2011 Name:_______________ Section:______________ Quiz 7A A U-shaped wire is connected across its open end by a conducting bar that is being pulled with constant speed v = 1.0 m/s away from the bottom. A magnetic field with magnitude B = 12 mT is directed perpendicular to the circuit. The width of the “U” is L = 30 cm and the resistance of the entire circuit is 90 mΩ at present. a) Calculate the value of the current induced in the wire. I = BLv/R = (12 mT)(30 cm)(1.0 m/s)/(90 mΩ) = 40 mA b) Calculate the value of the force felt by the bar as a result of the induced current in it. What is the direction (toward the bottom or top of the “U”) of the force? F = ILB = (40 mA)(30 cm)(12 mT) = 144 µN Toward the bottom

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Physics 222 Fall 2011 Name:_______________ Section:______________ Quiz 7B A U-shaped wire is connected across its open end by a conducting bar that is being pushed with constant speed v = 2.0 m/s toward the bottom. A magnetic field with magnitude B = 6.0 mT is directed perpendicular to the circuit. The width of the “U” is L = 20 cm and the resistance of the entire circuit is 80 mΩ at present.
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