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prac1-s06 - Physics 126 Practice Midterm#1 This practice...

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Physics 126: Practice Midterm #1 This practice midterm was the first midterm exam given during Winter 2006. The median score on this exam was 14/20. This is a closed-book exam lasting 90 minutes. You may use a calculator and a 3 x 5 “crib sheet.” The exam contains 20 multiple-choice questions. Useful Physical Constants: proton charge e = 1.602 × 10 -19 C Electron mass m e = 9.1 × 10 -31 kg Proton mass m p = 1.7 × 10 -27 kg Permittivity of free space ε 0 = 8.85 × 10 -12 C 2 /(N m 2 ) Coulomb’s law constant k = 1/(4 πε 0 ) = 8.99 × 10 9 N m 2 /C 2 Permeability of free space μ 0 = 4 π × 10 -7 T m/A Speed of light in vacuum c = 3.00 × 10 8 m/s Acceleration of gravity g = 9.8 m/s 2 Before you begin: 1. Fill in your name and section number on your Scantron sheet. Fill in your 8-digit UM ID (not your SSN) in the space indicated. 2. Fill in the version number of your exam in the area of the Scantron marked “Form.” Your exam version number is 1 . 3. Sign and date your Scantron.

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1. Two metal spheres A and B are touching. A negatively charged wand is brought close to the sphere A, as shown. The two spheres are separated slightly and the wand is taken away. At the end of this procedure: A) Sphere A is positive and B negative. B) Sphere A is negative and B positive. C) Both A and B are negative D) Both A and B are positive E) Both spheres are neutral. 2. The diagrams show five different charge situations. The charges are all the same distance from the origin. Rank the situations according to the magnitude of the electric field at the origin, from greatest to least. A) 1, 2, 3, 4 B) 4, 3, 2, 1 C) 2, 1, then 3 and 4 tie D) 1, 2, then 3 and 4 tie E) 4, 3, 1, 2 A B _ _ _ 5q -3q 2q 1 5q 3q 3q 5q -2q 5q 2q 5q 2q 5q 2q 2 3 4
3. Positive charge +Q is distributed uniformly on the upper half of a rod and negative charge –Q is distributed uniformly on the lower half. What is the direction of the electric field at the point P on the perpendicular bisector of the rod?

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