Fall 2009 - ng (hn3348) – Homework1 – Choi – (90211)...

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Unformatted text preview: ng (hn3348) – Homework1 – Choi – (90211) 1 This print-out should have 32 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. [General Physics 2][Homework1]———— —Due:15/Sep/2009 PM 11:59 in Korea 001 (part 1 of 5) 10.0 points A long non-conducting cylinder [dark gray] has a charge density ρ = αr , where α = 6 . 87 C / m 4 and r is in meters. Concentric around it is a hollow metallic cylindrical shell (light gray in the figure be- low). L 16 . 8 cm 11 . 5 cm 5 . 34 cm What is the electric field at 2 cm from the central axis? Assume the length L is very long compared to the diameter of the shell, and neglect edge effects. Answer in units of N / C. 002 (part 2 of 5) 10.0 points What is the electric field at 6 . 48 cm from the central axis? Answer in units of N / C. 003 (part 3 of 5) 10.0 points What is the direction of the electric field at 12 . 3 cm from the central axis? 1. Points radially inward. 2. The electric field is not a vector and there- fore has no direction. 3. Undetermined, since the field is zero. 4. Points radially outward. 004 (part 4 of 5) 10.0 points What is the electric field at 17 . 7 cm from the central axis? Answer in units of N / C. 005 (part 5 of 5) 10.0 points What is the surface charge density inside the hollow cylinder? Answer in units of C / m 2 . 006 10.0 points Five charges are placed in a closed box. Each charge (except the first) has a magnitude which is twice that of the previous one placed in the box. All charges have the same sign and (after all the charges have been placed in the box) the net electric flux through the box is 6 . 7 × 10 7 N · m 2 / C. What is the magnitude of the smallest charge in the box? Answer in units of μ C. 007 (part 1 of 2) 10.0 points The figure below shows the electric field lines for two point charges separated by a small distance. q 1 q 2 What are the signs of q 1 and q 2 ? 1. q 1 > 0 and q 2 < 2. q 1 > 0 and q 2 > 3. q 1 < 0 and q 2 > 4. q 1 < 0 and q 2 < 008 (part 2 of 2) 10.0 points The ratio R = q 1 q 2 satisfies 1. R > 1 2. < R < 1 3. − 1 < R < 4. R < − 1 ng (hn3348) – Homework1 – Choi – (90211) 2 009 10.0 points Imagine a charge in the middle between two parallel plate conductors. There is no net charge on the plates, and the plates are not connected to ground. q What will happen if the charge is moved a little away from the middle? 1. The charge will return to the middle. 2. The charge will remain stationary. 3. The charge will move away from the mid- dle....
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Fall 2009 - ng (hn3348) – Homework1 – Choi – (90211)...

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