Register to reply 
Electric Forcs and Work (Algebra based physics) 
Share this thread: 
#1
Feb2708, 09:30 PM

P: 2

Charges q1=+7.15 x 1005 C and q2=7.80 x 1004 C are placed at rest 71.5 cm apart. How much work must be done by an outside agent to move these charges slowly and steadily until they are 31.0 cm apart?
Ok so I tried a few things on my own, and got stuck. So I referred to a previous post from this morning for guidance: http://answerboard.cramster.com/phys...1996600.aspx however, I am still getting the wrong answer. I am using F = kq/r initially. The r value i am using was obtained by figuring out the distance one charge moved. (.715.31)/2. Then subtracting that distance from .715. So my r = .513m here. I get F = 968J. W = F*d = 968J * (.31m) = 300J. Am I missing something obvious. Any insight? Thanks. 


#2
Mar108, 12:22 PM

HW Helper
P: 1,979

Have you learnt about potential energy between two charges?



Register to reply 
Related Discussions  
Algebra based > calculus based physics  Academic Guidance  13  
Calculus based physics Vs. algebra based physics  Academic Guidance  32  
How do you guys/gals feel about HS algebrabased physics?  Academic Guidance  10 