p240_midterm_3_winn_practice

p240_midterm_3_winn_practice - Physics 240 Fall 2007: Exam...

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Version 3 Page 1 Physics 240 Fall 2007: Exam #3 Please print your name:___________________________________________________ Instructions 1. Fill in your name above 2. This will be a 1.5 hour, closed book exam. The exam includes 20 questions. 3. You may use a calculator, please do not share calculators 4. You may use three 3”x5” note cards with notes and equations you think may be useful. You can write on both sides of the card if you like. Table of constants: 0 = 8.85 x 10 -12 C 2 /Nm 2 k = 1/(4  0 ) q electron =-1.6 x 10 -19 C q proton =1.6 x 10 -19 C m electron =9.1 x 10 -31 kg m proton =1.67 x 10 -27 kg 0 = 4 x 10 -7 Tm/A G = 6.67 x 10 -11 Nm 2 /kg 2 Questions marked (P) have at least one answer choice that gives partial credit
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Version 3 Page 2 1. The primary of a 3:1 step-up transformer is connected to a source and the secondary is connected to a resistor R . The power dissipated by R in this situation is P . If R is connected directly to the source it will dissipate a power of: A) P /9 B) P /3 C) P D) 3 P E) 9 P 2. A long, straight wire is in the same plane as a wooden, non-conducting loop. The wire carries an increasing current I in the direction shown in the figure. In the wooden loop: A) There will be a clockwise induced emf, but no induced current. B) There will be a clockwise induced current in the loop. C) There will be a counterclockwise induced current in the loop. D) There will be no induced emf and no induced current. E) There will be a counterclockwise induced emf, but no induced current. 3. An inductor and a 100 Ω
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Page 3 4. The diagrams show three circuits with identical batteries, identical inductors, and
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p240_midterm_3_winn_practice - Physics 240 Fall 2007: Exam...

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