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# another exam - F or m 1 P h y si cs 240 F i r st P r a c t...

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Form 1 Phy s i c s 240 Fir s t Pra c ti ce Exam Fall 2010 1. Last Name:____________________ First Name:_____________________ 2. Please circle your discussion instructor and section below: In s tru c tor Tim e S ec tion David Gidley 9-10 100/101 Cagliyan Kurdak 10-11 200/201 David Winn 11-12 300/301 3. Fill in your name, 8 digit student ID number, discussion section number, and the exam F ORM number on the scantron sheet 4. There are 20 multiple choice problems worth 5 points each for a total of 100 points. Choose the one best answer and transfer it to the scantron sheet. You mu s t mark th e c orr t an s w e r on th e s c antron s h ee t to g e t c r e dit for th e probl e m . There is no penalty for guessing, so be sure to enter an answer for every question even if it is just a best guess. 5. At the end of the exam hand in both your scantron and exam booklet in separate piles set up by the proctors. 6. This is a closed book, 90 minute exam. Turn off and put away all electronic devices. You may use a calculator and one 3”x5” note card or equivalent. k = 1/4 πε 0 =9x10 9 Nm 2 /C 2 ε 0 = 8.85x10 -12 C 2 /Nm 2 e = 1.6x10 -19 C 1 eV= 1.6x10 -19 J μ = micro =10 -6 g = 9.8 m/s 2 m e = 9.1 x 10 -31 kg M P =1.67 x 10 -27 kg

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Version 1 Page 1 1. Point charges are arranged at the corners of a square with sides of length 1 m and Q = 5 x 10 -3 C. The charge at the lower left corner is negative while the other three are positive. What is the magnitude of the force on a proton located at the center of the square? Q Q ‐Q Q A) 2.3 x 10 -13 N B) 1.2 x 10 -11 N C) zero N D) 7.2 x 10 -12 N E) 2.9 x 10 -11 N 2. A hollow conductor is uncharged (neutral). A small negatively charged metal ball is lowered by a silk thread through a tiny opening in the top of the conductor and allowed to touch its inner surface. After the metal ball is removed, the ball will have: A) no appreciable charge B) a charge whose sign depends on where the small hole is located in the conductor C) a negative charge D) a positive charge E) a charge whose sign depends on what part of the inner surface it touched 3. Choose the FALSE statement concerning electric fields, field lines, and equipotential surfaces (EPS) under electrostatic conditions: A) field lines are close together where the electric field is large
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another exam - F or m 1 P h y si cs 240 F i r st P r a c t...

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