Field lines on parallel plates with same charge

1. Dec 17, 2012

mrcotton

1. The problem statement, all variables and given/known data
Draw the field lines between two parallel plates with +3V on one plate and +1V on the ther

2. Relevant equations

3. The attempt at a solution

The answer is (D) for a uniform field between the plates, however when two positive charges are drawn the field lines diverge as in (B)
Why is this so, the two situation seem to be very different when all we have done is spread the charge along a line.
Thanks for any help

Last edited: Dec 17, 2012
2. Dec 17, 2012

DimReg

Field lines can be a little confusing, so it's best to think about what they actually represent. The field lines are supposed to represent the electric field, which by F = qE, tells you how a positively charged particle will be accelerated. (so in A, the positively charged particle repells from the + and goes to the -. In B, it repels from both of them)

So what do you think a positively charged particle would do between the parallel plates?

3. Dec 17, 2012