I need some help in finding a way to solve the following problems.:(adsbygoogle = window.adsbygoogle || []).push({});

- Two equal positive charges q are on the y axis, one at y= +a and the other at y= -a.

a) Show that the electric field on the x axis is along the x axis with

E_{x}= 2kqx(x^{2}+ a^{2})^{-3/2}.

b) Show that near the origin, when the x is much smaller than a, E_{x}is approximately 2kqx/a^{3}.

c) Show that for values of x much larger than a, E_{x}is approximately 2kq/x^{2}. Explain why you would expect this result even before calculating it.

Thanks for your efforts!

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# Homework Help: Algebra of two equal positive charges

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