exam2-practice-dd - Physics II Exam 1 155 points Name...

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Part I. Questions 1-10. 8 points each. Multiple choice : For full credit , circle only the correct answer. For half credit , circle the correct answer and one incorrect answer. For ¼ credit, circle the correct answer and two incorrrect answers. 1 . The curve that best illustrates the relation between the current in a metallic conductor and the potential difference between its terminals is a. 1 b. 2 c. 3 d. 4 e. 5 2 . Two pieces of copper wire have the same length, but wire A has a square cross section of width s whereas wire B has a circular cross section of diameter s . Which of the following statements is true? a. The resistance of both wires is the same. b. The resistivity of both wires is the same. c. Both the resistance and the resistivity of A and B are the same. d. The resistance of A is greater than that of B. e. The resistivity of A is greater than that of B. 3 . In a parallel circuit, the a. current is the same in every branch. b. potential drop is the sum of those in all branches. c. potential drop is the same for each element of the parallel circuit. d. heat generated is the same in all the branches. e. overall resistance is the sum of the individual resistances of the branches. 4 . You want to use three resistors in a circuit. If each of them has a resistance of 2 , the configuration that will give you an equivalent resistance of 3 is a. 1 b. 2 c. 3 d. 4 e. None of these is correct. Page 1 of 6 Physics II Exam 1 155 points Name _______________ Discussion day/time_______________ C u r r e n t Potential 1 2 3 4 5 1 2 3 4 A B
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5 . A charged particle is fired towards the center of a cubical region of space where there is a uniform magnetic field oriented perpendicular to the initial velocity of the particle. Outside this region, there is no magnetic field.
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