quiz1_sol

# quiz1_sol - Physics 2B Quiz 1 Summer Session I 2009 Version...

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Unformatted text preview: Physics 2B Quiz 1 Summer Session I 2009 Version 0 Name: PID: Quiz ID: READ FIRST: Copy your assigned three digits quiz ID to the cover page, sign it, and return the bottom portion. Make sure you also write/fill in your scantron form your name, PID, quiz ID and the test version. 1. A proton is located at x = 3 . 0 nm, y = 0 . 0 nm and an electron is located at x = 0 . 0 nm, y = 1 . 0 nm. Find the attractive Coulomb force between them. Solution: F = ke 2 r 2 = 9 × 10 9 (1 . 6 × 10- 19 ) 2 (3 × 10- 9 ) 2 + (1 × 10- 9 ) 2 = 2 . 3 × 10- 11 (N) A. 2 . 3 × 10- 11 N B. 9 . × 10- 18 N C. 9 . × 10 8 N D. 3 . 7 × 10- 15 N 1. 2. A 10 . 0 C charge experience a 45 . 0ˆ x N force. What is the electric field at the location of the charge? Solution: ~ E = ~ F q = 4 . 50ˆ x N / C A. 4 . 5 ˆ x N/C B.- 4 . 5 ˆ x N/C C. 0 . 45 ˆ x N/C D. 4 . 5 ˆ y N/C 2. 3. A thin wire 9 . 0 m long has a charge of 1 . 0 nC. Find the electric field strength 2.0 mm from the end of the wire. Solution: Use the principle of superposition: E = Z k dq r 2 = Z 9 9 × 10 9 ( x + 0 . 002) 2 1 × 10- 9 dx 9 = 1 ( x + 0 . 002) 2 9 ≈ 500N/C Physics 2B Quiz 1 Summer Session I 2009 Version 0 A. 500 N/C B. 20 N/CB....
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## This note was uploaded on 07/26/2009 for the course PHYS 2b taught by Professor Schuller during the Summer '08 term at UCSD.

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quiz1_sol - Physics 2B Quiz 1 Summer Session I 2009 Version...

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