2- Coulomb 2-solutions

# 2- Coulomb 2-solutions - gilvin(jg47854 – 2 Coulomb 2 –...

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Unformatted text preview: gilvin (jg47854) – 2: Coulomb 2 – meyers – (21235) 1 This print-out should have 9 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. This homework is due Thursday,January 27, at midnight Tucson time. 001 10.0 points A charge of +1 Coulomb is place at the 0- cm mark of a meter stick. A charge of − 1 Coulomb is placed at the 100-cm mark of the same meter stick. Is it possible to place a proton somewhere on the meter stick so that the net force on it due to the two charges is 0? 1. Yes; to the right of the 50-cm mark 2. No correct 3. Yes; to the left of the 50-cm mark Explanation: The proton is repelled from the +1 Coulomb charge and attracted to the − 1 Coulomb charge. Both forces act in the same direction so they cannot cancel out. 002 10.0 points A charge of +1 coulomb is place at the 0- cm mark of a meter stick. A charge of +4 coulombs is placed at the 100-cm mark of the same meter stick. Where should a proton be placed on the meter stick so that the net force on it due to the two charges is 0? Correct answer: 33 . 3333 cm. Explanation: The forces are both repulsive and point in opposite directions. The force due to the +1 charge is F 1 = k (+1) (+1) r 2 1 = k r 2 1 and due to the +4 charge, F 4 = k (+4) (+1) r 2 4 = 4 k r 2 4 . In order for these forces to be equal, k r 2 1 = 4 k r 2 4 r 2 4 = 4 r 2 1 = (2 r 1 ) 2 r 4 = 2 r 1 d − r 1 = 2 r 1 r 1 = 1 3 d = 100cm 3 = 33 . 3333 cm 003 10.0 points A charge q 1 of − 4 . 00 × 10- 9 C and a charge q 2 of − 2 . 30 × 10- 9 C are separated by a distance of 40 . 0 cm....
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## This note was uploaded on 04/29/2011 for the course PHYS 202 taught by Professor Doc during the Spring '11 term at North Texas.

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2- Coulomb 2-solutions - gilvin(jg47854 – 2 Coulomb 2 –...

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