0000 phys 2426 Midterm web sample.docx

0000 phys 2426 Midterm web sample.docx - Physics 2426...

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Physics 2426 Midterm Chapters 21 - 29 Brad Moore – Web Sample (Summer 2010) Name: Section: Select the response that best answers the given statement. Be sure to write all final multiple choice answers on your Scantron answer sheet. 1) When atom A loses an electron to atom B, A) atom A acquires more neutrons than atom B. B) atom A becomes a negative ion and atom B becomes a positive ion. C) atom A acquires less neutrons than atom B. D) atom A becomes more negative than atom B. E) atom A becomes a positive ion and atom B becomes a negative ion. 2) Three point charges are located at the following positions: Q 1 = 2.00 μC at x = 1.00 m; Q 2 = 3.00 μC at x = 0; Q 3 = -5.00 μC at x = -1.00 m. What is the magnitude of the force on the 3.00-μC charge? A) 5.40 × 10 -2 N B) 0.158 N C) 0.189 N D) 0.135 N E) 8.10 × 10 -2 N 3) Consider a spherical Gaussian surface of radius R centered at the origin. A charge Q is placed inside the sphere. Where should the charge be located to maximize the magnitude of the flux of the electric field through the Gaussian surface? A) at x = 0, y = 0, z = R/2 B) at x = 0, y = R/2, z = 0 C) at x = R/2, y = 0, z = 0 D) at the origin E) The flux does not depend on the position of the charge as long as it is inside the sphere 4) A charge q = 2 μC is placed at the origin in a region where there is already a uniform electric field = (100 N/C) î. Calculate the flux of the net electric field through a Gaussian sphere of radius R = 10 cm centered at the origin. A) 5.52 × 10 5 N m 2 /C B) 0.565 × 10 5 N m 2 /C C) 2.26 × 10 5 N m 2 /C D) 1.13 × 10 5 N m 2 /C E) 0 1
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FIGURE 23-1 5) Fig. 23-1 shows equipotentials surrounding a pair of charges QA and QB. The value of the potential half-way between the charges is indicated. Which of the statements below applies to the charges? A) Nothing can be said about the charges.
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