Physics 212 Exam 1 Sample 1 - Physics 212 Midterm 1 Sample...

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Physics 212 Midterm 1 Sample Form A 1. A neutral metal ball is suspended by a string. A positively charged insulating rod is placed near the ball, which is observed to be attracted to the rod. This is because: A. the ball becomes positively charged by induction. B. the ball becomes negatively charged by induction. C. the number of electrons in the ball is more than the number in the rod. D. the string is not a perfect insulator. E. there is a rearrangement of electrons in the ball. 2. The figures show two positively charged spheres of equal mass, each suspended by a string of equal length. Sphere A has twice as much charge as B. Which of the following figures correctly depicts the entire system in static equilibrium? A A B B A B C A B E A B D B A A. A B. B C. C D. D E. E Page 1
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Physics 212 Midterm 1 Sample Form A 3. The figure shows two charges q 1 = q 2 = 20 μ C held at a fixed distance d = 2 m apart. A third charge q 3 = 40 μ C is brought and placed as shown in the figure, forming an equilateral triangle with the other two. What is the magnitude and direction (with respect to the positive x axis) of the total electrostatic force on q 1 . d d d q 1 q 2 q 3 y x A. 2.4 N, 131° B. 2.7 N, 152° C. 0.9 N, 90° D. 0.9 N, 47° E. 2.7 N, 180° 4. A +50 μ C is fixed at the origin ( x = 0) and a +30 μ C charge is fixed on the x axis at x = 4m. What is the x component of the force on a –40 μ C charge when it is placed at x = 2m on the x axis? A. 0 B. 20.7 N C. –20.7 N D. 3.6 N E. –1.8 N 5. A 200-N/C electric field is in the positive x direction. The force on an electron in this field is: A. 200 N in the positive x direction B.
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This note was uploaded on 03/02/2008 for the course PHYS 212 taught by Professor Mahlon,gregoryda during the Spring '07 term at Pennsylvania State University, University Park.

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Physics 212 Exam 1 Sample 1 - Physics 212 Midterm 1 Sample...

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