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 with . b)show that near the origin,when x is much smaller than a,E,is approximately 2kqx/a^3.

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 with < Ex=2kqx/(x^2+a^2)^3/2 > .
b)show that near the origin,when x is much smaller than a,E,is approximately 2kqx/a^3.

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