2 positive charges q are a distance s apart on the y axis(adsbygoogle = window.adsbygoogle || []).push({});

a) find an expression for the electric field vector at distance x on the axis that bisects the 2 charges

b)thy these sanity checks on your answer: what is the direction of the electric field for positive and for negative values of x? What is the limit of your expression for E_vector as x --> infinity

OK, these questions are somewhat simple, yet confusing; I don't get what they're really asking. Please help.

for a) what I get for a is E_vector net = (q/4piEo){[1/(s-x)^2] - [1/x^s]}j_unit N/C

for b) I don't get what do they mean by +ve/-ve values of x. Isn't x a distance? Then how could it be negative? What I do know that if the position is at infinity then r^2 would get really large to the point that E is zero.

What I did in a is assuming that x is somewhere between the 2 charges. Now if they say that x can be either positive/negative, what is that supposed to mean?

These questions just don't make sense. Please forgive me/don't flame me but it's 4 A.M. and I'm desperate trying to solve these problems when some questions have really poor wordings and are damn confusing, and just don't make much sense to the point I wish whoever make these questions would just stop and let the others who can compose better write up/make the questions instead. :grumpy:

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# Homework Help: Electric field vector

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