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Uniform Charge, Electric Field 
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#1
Jun2109, 06:52 PM

P: 15

1. The problem statement, all variables and given/known data
A very long uniform line of charge has charge per unit length 5.38 micro coulombs /m and lies along the xaxis. A second long uniform line of charge has charge per unit length 3.66 micro coulombs /m and is parallel to the xaxis at y = 0.400m. What is the net magnitude of the electric field at the point y = 0.200m? Give your answer in N/C in scientific notation to three significant digits. 2. Relevant equations E=1/2pi(Epsilon)*[Uniform Charge length/R^2] 3. The attempt at a solution I tried summing the two electric fields by using the above equation for each uniform charge and adding them together, however the answer is wrong. I also used 1/4pi(epsilon) but it was still wrong, what am i missing? 


#2
Jun2109, 06:56 PM

HW Helper
P: 5,341

Add like a vector instead of just summing, because direction matters. In this case since they are opposite signs, and your point is in the middle, your answer should be ... E = E1 + E2 


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