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Two positive charges, each with charge $+Q$, are separated by a distance $2L$. A charge $-Q$ is located at a distance $d$ perpendicular to the midpoint of a line between the two positive charges. The arrangement is shown in the figure below.

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Which expression below represents the magnitude of the net force $F_N$ that acts on the negative charge?

A

$F_N = \cfrac{1}{2 \pi \epsilon_o} \cfrac {d \:Q^2}{ {(L^2 +d^2)^{ 1/2}}}$

B

$F_N = \cfrac{1}{2 \pi \epsilon_o} \cfrac {d \: Q^2}{ {(L^2 +d^2)}}$

C

$F_N = \cfrac{1}{2 \pi \epsilon_o} \cfrac {d \: Q^2}{ {(L^2 +d^2)^{ 3/2}}}$

D

$F_N = \cfrac{1}{2 \pi \epsilon_o} \cfrac {d \: Q^2}{ {(d^2)^{ 3/2}}}$

E

$F_N = \cfrac{1}{4 \pi \epsilon_o} \cfrac {d \: Q^2}{ {(L^2 +d^2)^{ 3/2}}}$

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