2008PracticeExam2

# 2008PracticeExam2 - Name: _ Code # _ Summer Session 2008...

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Name: ________________________________________ Code # _________ Summer Session 2008 ID: X 1 UCSD Physics 2B Practice Exam 2 Potential, Work & Capacitors READ ME !!! Helpful Hints: Do this exam a few times. .. Once without the answers, Once after seeing the solutions & Once again with your formula sheet This is a good time to add formulas/constants to your sheet. Remember, this is a timed exam. .. work swiftly so you have time to check your answers. 1. The voltage between the cathode (negative plate) and the (positive) screen of a computer monitor is 12.0 kV . If an electron leaves the cathode at rest , what is its speed as it hits the screen? Electron mass is m e = 9.11 × 10 31 kg A. 2.96 × 23 m s B. 6.49 × 7 m s C. 2.05 × 6 m s D. 7.7 × 15 m s 2. How much work is done by moving a charge q = 2.0 C between two points which potential difference is Δ V = 6.0 V ? A. 2.0 J B. 3.0 J C. 6.0 J D. 12 J 3. You want to store 7.30 × excess electrons on the negative plate of a capacitor at V = 12.0 V . How large a capacitor must you use? A. 0.166 μ F B. 6.08 × 9 F C. 1.40 × 7 F D. 973 p F

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Name: ________________________ ID: A 2 4. The electric potential in a region of space is given by Vx , y Ê Ë Á ˆ ¯ ˜ = 55 V + 33 V m Ê Ë Á Á Á Á Á Á ˆ ¯ ˜ ˜ ˜ ˜ ˜ ˜ x 22 V m 2 Ê Ë Á Á Á Á Á Á ˆ ¯ ˜ ˜ ˜ ˜ ˜ ˜ y 2 What is the electric field in this region? A. + V m Ê Ë Á Á Á Á Á Á ˆ ¯ ˜ ˜ ˜ ˜ ˜ ˜ i 8 C. V m + V m V m Ê Ë Á Á Á Á Á Á ˆ ¯ ˜ ˜ ˜ ˜ ˜ ˜ i 8 + j 8 Ê Ë Á Á ˆ ¯ ˜ ˜ B. + V m Ê Ë Á Á Á Á Á Á ˆ ¯ ˜ ˜ ˜ ˜ ˜ ˜ i 8 + V m 2 Ê Ë Á Á Á Á Á Á ˆ ¯ ˜ ˜ ˜ ˜ ˜ ˜ y j 8 D. V m Ê Ë Á Á Á Á Á Á ˆ ¯ ˜ ˜ ˜ ˜ ˜ ˜ i 8 + 44 V m 2 Ê Ë Á Á Á Á Á Á ˆ ¯ ˜ ˜ ˜ ˜ ˜ ˜ y j 8 5. You connect three capacitors as shown in the diagram below. C 1 = C 2 = 5.00 μ F and C 3 = 10.0 F . What is the equivalent capacitance of this network? A. 5.00 F B. 10.0 F C. 15.0 F D. 3.33 F 6. Two protons in a Helium nucleus (2 protons & 2 neutrons) are 6.0 × 10 15 m apart. What is the electrostatic potential energy (energy of assembly) of this pair?
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## This note was uploaded on 08/23/2008 for the course PHYS 2b taught by Professor Schuller during the Summer '08 term at UCSD.

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2008PracticeExam2 - Name: _ Code # _ Summer Session 2008...

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