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Three charges of different magnitudes are arranged in a straight line as shown in the diagram above, with the middle charge located directly between the two outer charges.

Which of the following is a correct expression for the magnitude of the net electric force acting on the leftmost charge?

A

$\dfrac {{2kQ }^{ 2 }}{ { d }^{ 2 }}$

B

$\dfrac {{4kQ }^{ 2 }}{ { d }^{ 2 }}$

C

$\dfrac {{8kQ }^{ 2 }}{ { d }^{ 2 }}$

D

$\dfrac {{10kQ }^{ 2 }}{ { d }^{ 2 }}$

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