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Electricity and Magnetism

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Maximal Coulomb Repulsion of a Divided Charge

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EANDM-GJ2AFR

A charge $Q$ is divided into two parts $(Q-x)$ and $x$.

What is the value of $x/Q$ if the two parts, placed a certain distance apart, are to have maximal Coulomb repulsion?

A

$x/Q=0$.

B

$x/Q=1$.

C

$x/Q$ depends on the distance the two charges are placed at.

D

$x/Q=1/2$.