03 - Electric Field I

03 - Electric Field I - Phys 212 Fall 2009 Electric Field...

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Phys 212 - Fall 2009 8/26/2009 Electric Field
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Conductors A metal ball hangs from the ceiling by an insulating thread. The ball is attracted to a positive-charged rod held near the ball. The charge of the ball must be: 1) positive 2) negative 3) neutral 4) positive or neutral 5) negative or neutral
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Proton vs. Electron A proton and an electron are held apart a distance of 1.0 m and then released. Which particle has the larger acceleration at any one moment? p e 1) proton 2) electron 3) both the same 4) not enough information
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Charges in a plane Determine the magnitude and direction of the net electrostatic force on q 1 . Step 1. Determine individual forces on q 1 and draw free body diagram (Note the coordinate system) q 2 attracts q 1 - F 12 q 3 attracts q 1 - F 13 Force F 12 has x and y components!
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Charges in a plane F 12 = k | q 1 || q 2 | r 12 2 = (8.99 E 9 Nm 2 / C 2 ) (4.0 E 6 C )(6.0 E 6 C ) (0.15 m ) 2 = 9.6 N F 13 = k | q 1 || q 3 | r 13 2 = (8.99 E 9 Nm 2 / C 2 ) (4.0 E 6 C )(5.0 E 6 C ) (0.1 m ) 2 = 18 N Step 2. Determine magnitude of individual forces on q 1 F 12 = (9.6 N )cos(73 ° ) ˆ i + (9.6 N )sin(73 ° ) ˆ j F 13 = (18 N ) ˆ i + (0 N ) ˆ j F = (21 N ) ˆ i + (9.2 N ) ˆ j Step 3.
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